FINAL D RAFT UGANDA 
STANDARD  
  FDUS 903 -1 
First Edition  
2011 -mm-dd 
 
 
 Reference number  
FDUS 903 -1: 2011 
© UNBS 2011   
  
Double -capped fluorescent lamps  — Performance 
specifications — Part 1: Minimum Performance Standards 
(MEPS)  
 FDUS 903 -1: 2011  
ii © UNBS 2011  – All rights reserved  
 Compliance with this standard does not, of itself confer immunity from legal obligations  
A Uganda Standard does not purport to include all necess ary provisions of a contract. Users are 
responsible for its correct application  
© UNBS 2011   
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilised in any 
form or by any means, electronic or mechanical, i ncluding photocopying and microfilm, without prior written 
permission from UNBS.  
Requests for permission to reproduce this document should be addressed to  
The Executive Director  
Uganda National Bureau of Standards  
P.O. Box 6329  
Kampala  
Uganda  
Tel: 256 41 4 505 995  
Fax: 256 41 4 286 123  
E-mail: unbs@infocom.co.ug  
Web: www.unbs.go.ug  FDUS 903 -1:2011  
© UN BS 2011  – All rights reserved  iii 
 Contents  Page 
Foreword  ................................ ................................ ................................ ................................ ...................... iv 
1 Scope  ................................ ................................ ................................ ................................ ................ 1 
2. Normative references  ................................ ................................ ................................ ....................... 2 
3 Definitions ................................ ................................ ................................ ................................ ......... 2 
4 Performance requirements  ................................ ................................ ................................ .............. 3 
4.1 General ................................ ................................ ................................ ................................ .............. 3 
4.2 Minimum Energy Performance Standa rd (MEPS)  ................................ ................................ ........... 3 
4.3 Test conditions for determining Minimum Energy Performance Standard of tubular 
fluorescent lamps  ................................ ................................ ................................ ............................. 4 
4.4 Number of  tests and processing of data  ................................ ................................ ......................... 4 
4.5 Environment criteria  ................................ ................................ ................................ ......................... 4 
4.5.1 General ................................ ................................ ................................ ................................ .............. 4 
4.5.2 Permissible limit  ................................ ................................ ................................ ............................... 4 
4.5.3 Test procedure  ................................ ................................ ................................ ................................ .4 
4.5.4 Compliance  ................................ ................................ ................................ ................................ .......4 
5 Application and test results formats  ................................ ................................ ............................... 4 
5.1 Application for registration  ................................ ................................ ................................ .............. 4 
5.1.1 General ................................ ................................ ................................ ................................ .............. 4 
5.1.2 Registration  ................................ ................................ ................................ ................................ ......4 
5.1.3 Test report  ................................ ................................ ................................ ................................ ........ 5 
5.1.4 Supporting documents  ................................ ................................ ................................ .................... 5 
5.1.5 MEPS transition  ................................ ................................ ................................ ................................ 5 
5.2 Holding of records  ................................ ................................ ................................ ............................ 5 
5.2.1 General ................................ ................................ ................................ ................................ .............. 5 
5.2.2 Data  ................................ ................................ ................................ ................................ ................... 5 
5.2.3 Test report  ................................ ................................ ................................ ................................ ........ 5 
5.2.4 Availability  ................................ ................................ ................................ ................................ ........ 5 
Annex  A (normative)  Application for registration of tubular fluorescent lamp for MEPS  ........................ 6 
A.1 Scope  ................................ ................................ ................................ ................................ ................ 6 
A.2 Application form  ................................ ................................ ................................ ............................... 6 
Annex  B (normative)  Summary test report for a tubular fluorescent lamp for MEPS  ............................... 9 
Bibliogra phy ................................ ................................ ................................ ................................ ................  11 
 FDUS 903 -1: 2011  
iv © UNBS 2011  – All rights reserved  
 Foreword  
Uganda National Bureau of Standards (UNBS) is a parastatal under the Ministry of Tourism, Trade and 
Industry established under Cap 327 , of the Laws of Uganda.  UNBS is mandated to co -ordinate the 
elaboration of standards and is  
(a) a member of International Organisation for Standardisation (ISO) and  
(b) a contact point for the WHO/FAO Codex Alimentarius Commission on Food Standards, and  
(c) the National Enquiry Point on TBT/SPS Agreements of the World Trade Organisatio n (WTO).  
The work of preparing Uganda Standards is carried out through Technical Committees. A Technical 
Committee is established to deliberate on standards in a given field or area and consists of representatives of 
consumers, traders, academicians, manuf acturers, government and other stakeholders.  
Draft Uganda Standards adopted by the Technical Committee are widely circulated to stakeholders and the 
general public for comments. The committee reviews the comments before recommending the draft standards 
for approval and declaration as Uganda Standards by the National Standards Council.  
Committee membership  
The following organizations were represented on the Energy Management  Technical Committee , UNBS/TC 
13, during the development of this standard:  
 Department  of Mechanical Engineering, Makerere University  
 Econoler  
 Electricity Regulatory Authority (ERA)  
 GTZ-Promotion of Renewable Energy and Energy Efficiency Programme (GTZ -PREEEP)  
 Ministry of Energy and Mineral Development  
 Private Sector Foundation Uganda (PSFU ) 
 Uganda Manufacturers’ Association (UMA)  
 Uganda National Bureau of Standards (UNBS)  
 Water and Electricity Consumers’ Association (WECA)  
 
The following organizations were represented on the Lighting Appliances Sub -committee of the Energy 
Management Techni cal Committee,  UNBS/TC 13, during the development of this standard:  
 Centre for Research in Energy and Energy Conservation (CREEC), Makerere University  
 Department of Electrical Engineering, Makerere University  
 Econoler   
 Industrial Technical Solutions (ITS) (U) Ltd  
 Kiboko Enterprise (U) Ltd  
 Ministry of Works and Transport  
 Osram/Dembe Trading Co. Ltd  
 Uganda National Bureau of Standards (UNBS)  FDUS 903 -1:2011  
© UN BS 2011  – All rights reserved  v 
  Uganda National Chamber of Commerce and Industry (UNCCI)  
 Ultra -Tec Uganda Ltd  
 FINAL DRAFT UGANDA STANDARD  FDUS 903 -1: 2011  
 
© UNBS 2011 – All rights reserved  1 
 Double -capped fluorescent lamps  — Perfo rmance 
specifications — Part 1: Minimum Performance Standards 
(MEPS)  
1 Scope  
1.1 This Final Draft Uganda Standard specifies Minimum Energy Performance Standard (MEPS) 
requirements for double -capped [FD1) and FDH2)] tubular fluorescent lamps with a nominal length of 550 mm 
to 1500 mm and having nominal lamp wattage of 16 watts or more, that are within the scope of US IEC 60081 . 
This standard further specifies the following:  
a) efficacy determination ; 
b) minimum energy performance standard requirements ; 
c) colour rendering index requirements ; and  
d) test report format.  
This standard covers lamps for general illumination purposes, for use in luminaires and  with lamp ballasts 
connected to a 2 40 V 50 Hz single phase or similar mains supply. Lamps  that are intended for use on ly with 
high frequency (electronic) ballasts are also covered.  
1.2 This standard does not apply to lamps that are clearly not intended for general illumination, specifically : 
a) lamps with a dominant colour or with an output that is predominantly outside the visible spectrum;  
b) lamps for colour matching and that have a colour rendering index greater than 90 and a colour 
appearance approximating to a point on the black body locus;  
c) lamps that are specifically for use in an industrial or agricultural process;  
d) lamps  for medical applications; or  
e) lamps that have been given written exemption by the relevant regulatory authority on the grounds that 
they are for a specific purpose other than general illumination and are clearly distinguishable from 
lamps for general illum ination.  
This standard does not specify electrical safety requirements.  
1.3 This Standard shall be used in conjunction with  US IEC 60081  and FDUS 903 -2. 
                                                   
1) FD is a linear double capped fluorescent lamp . 
2) FDH is a double capped fluorescent lamp for high frequency ballasts only . FDUS 903 -1: 2011  
2 © UNBS 2011  – All rights reserved  
 2. Normative references  
The following referenced documents are indispensable for the application of thi s document. For dated 
references, only the edition cited applies. For undated references, the latest edition of the referenced 
document (including any amendments) applies.  
CIE 13.3 —1995 , Method of measuring and specifying colour rendering properties of lig ht sources  
Commission of the European Communities Commission Directive 98/11/EC implementing Council Di rective 
92/75/EEC with regard to energy labelling of household lamps  
FDUS 903-2, Double -Capped Fluorescent Lamps — Performance Specifications — Part 2: Procedure for 
quantitative analysis of mercury present in fluorescent lamps  
US IEC 60081 , Double -capped fluorescent lamps  — Performance specification  
3 Definitions  
For the purposes of this standard, the terms and definitions given in US IEC 60081  and the f ollowing apply.  
3.1 
check test 
full or part test in accordance with US IEC 60081 to verify the initial efficacy, maintained efficacy and/or colour 
rendering index of an individual model.  A further test in accordance with FDUS 903 -2 to verify the quantity o f 
mercury present in each fluorescent lamp.  
3.2  
Colour Rendering Index (CRI)  
relative measure of the shift in surface colour of an object when lit by a particular lamp, compared with how 
the object would appear under a reference light source. CRI is a num erical representation that rates the 
‘colour rendering’ ability of a light source in comparison with natural daylight, which has a CRI of 100.  
3.3  
efficacy  
ratio of lamp lumen output to the power dissipated in the lamp under the specified conditions of me asurement. 
Symbol: F, units: lumens watts-1. Efficacy is normally determined at a specified point in the lamp life (re fer to 
3.4 and 3.5 ). 
3.4 
initial efficacy  
efficacy  measured on a new lamp after 100 h of operation. Symbol: F 100, units: lumens watts-1. 
3.5 
maintained efficacy  
efficacy measured at 5000 h of lamp life. Symbol: F M, units: lumens watts−1. Maintained efficacy F M shall be 
determined as stated in 4.2. 
3.6 
family of models  
range of models of the one brand, for which a single set of test reports i s applicable and where each of the 
models has the same relevant physical characteristics, efficacy, and performance characteristics (including 
colour rendering index). The term ‘model’ is synonymous with ‘family of models’.  
3.7 
measured quantities  
quantiti es used in this standard measured during tests carried out in accordance with  US IEC 60081  and 
FDUS 903 -2 FDUS 903-1: 2011  
© UNBS 2011  – All rights re served  3 
 3.8 
rounding  
unless otherwise stated, numbers shall be rounded and recorded to five significant figures  
3.9 
supplier  
In Uganda  ‘supplier’ means  manuf acturer or, where a completed product is manufactured for exclusive supply 
to a second agent, the second agent may be identified as the supplier. For products manufactured outside 
Uganda  ‘supplier’ means manufacturer’s local agent or importer, having an ad dress in the country(s) where 
the product is sold (Uganda).  
4 Performance requirements  
4.1 General  
All fluorescent lamps covered within the scope of Clause 1.1, shall conform to the performance criteria 
specified in clauses below.  
4.2 Minimum Energy Perfor mance Standard (MEPS)  
Each tubular fluorescent lamp shall meet the requirements in Table 1 for initial efficacy  (F100), maintained 
efficacy (FM) and minimum CRI.  
FM may be calculated from test data measured at more or less than 5  000 h as follows:  
a) Where lu men data is not available for 5  000 h, any unadjusted single measurement at more than 5  
000 h may be used to confirm the  FM requirements.  
b) Where a lumen measurement is available for over 2  000 h but less than 5  000 h, F M may be 
calculated as follows : 
(i) by lin ear extrapolation from the F 100 value through the measured data point to 5  000 h; or  
(ii) by linear interpolation between a point in the range of 2  000 h to 5000 h and second point 
in the range 5  000 h to 8 000 h.  
c) Where a lumen measurement is available for over  5 000 h but less than 8  000 h, F M may be 
calculated by linear interpolation between a point in the range of 2  000 h to 5 000 h and second point 
in the range 5  000 h to 8000 h.  
Table 1  — Lamp efficacy r equirements  
Lamp nominal length L , 
mm mandatory  550 < L < 700  700 < L < 1150  1150 < L < 1350  1350 < L < 1500  
Lamp typical power , 
watts  (informative)  16 - 24 17 - 40 28 - 50 35 - 80 
Initial efficacy , 
Maintained efficacy  F 100 > 66.0 and FM 
> 57.5 F 100 > 74.0 and FM 
> 61.0 F 100 > 80.0 and FM > 
70.0 F 100 > 85.0 and  
FM > 70.0 
Minimum CRI  79 79 79 79 
 FDUS 903 -1: 2011  
4 © UNBS 2011  – All rights reserved  
 4.3 Test conditions for determining  Minimum Energy Performance Standard of tubular 
fluorescent lamps  
Initial lamp efficacy (lumen output and lamp power) shall be determined in accordance with  US IEC 60081 , 
except that tests on high frequency operated lamps with a nominal diameter of 16 mm (T5) may be made at 
an temperature of 35ºC (instead of 25  ºC). 
Maintained efficacy (lumen output and lamp power) shall be determined in accordance with  US IEC 60081 
Colour ren dering index (CRI) shall be determined in accordance with CIE 13.3 —1995.  
4.4 Numbe r of tests and processing of data 
For the purposes of verification of the rated values of a model at least one unit of the nominated model should 
be tested in accordance with  the standards specified in 4.3. 
More than one unit may be tested at the supplier’s discretion. A test report in accordance with Annex B should 
be submitted for each of the MEPS requirements specified in 4.2. 
NOTE Products may be registered on the basis of  manufacturer’s published data.  
4.5 Environment criteria  
4.5.1 General  
This clause specifies the maximum permissible quantity of mercury in a fluorescent lamp  and further specifies 
test procedures to determine the quantum of mercury. The  requirements in Cl auses 4.5.2 to 4.5.4 shall apply.  
4.5.2 Permissible limit  
The maximum quantity of mercury present in fluorescent lamps shall not exceed 15 mg.  
4.5.3 Test procedure  
The quantity of mercury present is determined in accordance with the relevant clauses of  FDUS 903 -2. 
4.5.4 Compliance  
Compliance is verified in accordance with clauses of FDUS 903 -2. 
5 Application  and test results f ormats  
5.1 Application for registration  
5.1.1 General  
Where the relevant regulatory authority requires registration or approval of Mi nimum  Energy Performance 
standard requireme nts, clauses 5.1.2 and 5.1.3 shall apply.  
5.1.2 Registration  
For MEPS registration of the tubular fluorescent lamp brand and model, or type, an application in the format 
shown in Annex A of this standard shall be submitted.  
To register, the relevant state regulatory authority  should be contact ed. FDUS 903-1: 2011  
© UNBS 2011  – All rights re served  5 
 5.1.3 Test report  
A test report summary in accordance with Annex B for each model tested should be submitted, if available, 
with the MEPS application.  
Where a summary repo rt in accordance with Annex B is not submitted, the source of data in the MEPS 
application shall be indicated in Annex A. 
5.1.4 Supporting documents  
All supporting documents and test reports used in the MEPS application and any summary report in Annex B 
shall be made available to the relevant regulatory authority upon request. These records shall be retained for 
at least five years after the last date of manufacture or import, whichever is applicable.  
5.1.5 MEPS transition  
All products within the scope of M EPS manufactured or imported for sale into Uganda  on or after 1 October 
2010  shall meet the MEPS requirements specified in 4.2 and such units must hold a valid registration at the 
time of sale which indicates compliance with the relevant MEPS requirements.  
5.2 Holding of records  
5.2.1 General  
Where the registration or approval of MEPS is not required, 5.2.1 to 5.2.4  shall apply.  
NOTE Uganda  does not operate a registration process but does require submission of information for mandatory 
listing. Therefore su ppliers should ensure that the products are  registered using the form in Annex A and be  submitted to 
the relevant authority . 
5.2.2 Data  
Annex A, Section 2 to Section 6 outline the information that shall be recorded and held by the lamp supplier to 
support the performance claims inherently made with respect to MEPS.  
5.2.3 Test report  
A test report summary in accordance with Annex B for each model tested should be submitted with the MEPS 
application. A detailed test report used in the MEPS application shall b e retained by the supplier.  
5.2.4 Availability  
The documents required by this section shall be made available to the relevant regulatory authority upon 
request. Records shall be retained for at least five years after the last date of manufacture or import,  
whichever is applicable.  FDUS 903 -1: 2011  
6 © UNBS 2011  – All rights reserved  
 Annex  A 
(normative)  
 
Application for registration of tubular fluorescent lamp for MEPS  
A.1 Scope  
This anne x sets out the required format for submitting an application for registration  and record keeping.  
A.2 Application form 
(Plea se type or print)  
Section 1 : Application Details  
Name of applicant:  
Company name:  
Company address:  .............................................................................................................  
.............................................. ...............................................................  
.............................................................................................................  
Contact person:  
(Details for a person 
in Uganda shall be  
provided)  Name:  
Address:  
Position/Title:  
Telephone:  
Facsimile:  
E-mail:  ......................................................................  
.....................................................................  
.................................................................... .. 
......................................................................  
......................................................................  
......................................................................  
The Standard under which this applicati on is 
made:  FDUS 903-1 
What is this application for:  MEPS 2009  
Is the application meant for a single model or a 
family of models? (identify one)   
Section 2: Description of Tubular Fluorescent Lamp  
Brand name:   
Model name ( if available):   
Model numbe r or family 
number:   
Other model numbers to be 
included under this 
registration:   
Country of manufacture:   
Is the product to be sold in?  Uganda  
Not stated  
Year and month in which 
model first available in 
Uganda:   
 
 FDUS 903-1: 2011  
© UNBS 2011  – All rights re served  7 
  
Does the lamp model have 
any mark ings to indicate 
date, serial number or 
batch number?  Yes  
No 
Does this model or family 
replace or supplement 
another model or family  
with identical efficacy and 
lumen output 
characteristics?  (identify 
one) Yes 
No 
If yes, indicate relevant 
details:  Model  name:  Model number:  Registration number:  
Section 3: Testing and test report  
Which of the following does 
the test and report rely on?  1  A test report summary submitted with a previous application  
2  A summary test report in the format of Annex B that is  supplied 
with this application  
3  Published data by the manufacturer  
4  Unpublished data from the manufacturer  
5  Correspondence from the manufacturer  
6  Other data — please specify  
(Proceed to Section 4 if options 3, 4, 5 or 6 are selected)  
(If optio n 1 is selected, note the source registration number and 
proceed to Section 4)  
Test laboratory type:  
(identify one)  Own ‘in -house’ or manufacturer’s laboratory  
Independent laboratory  
Test laboratory name:   
Test laboratory address:   
Test laboratory loca tion: 
(indicate correct answer)  Uganda  
Other - (please specify):  
Test laboratory 
accreditation:   
Test Standard used:  
(Identify one)  US IEC 60081  
Other -(specify)  
Test report number(s) and 
date(s):   
Section 4 : Specific product details  
Nominal length (mm)   
Nominal diameter (mm)   
Nominal wattage (watts)   
ILCOS code   
Lamp frequency  50 Hz  
High frequency  
 
 FDUS 903 -1: 2011  
8 © UNBS 2011  – All rights reserved  
 Section 5 : Test Results/Rated Values  
Data below is based on rated values or test results supported with a summary test report in accordance with 
Annex B 
Is the data below based on       rated values                                              test results  
Colour rendering index (CRI)  
[According to CIE 13.3 -1995]   
Initial lumens (L)   
Initial lamp watts (W)   
Initial efficacy, F 100 (lumens/watt)   
Maintained lumens (L)   
Maintained lamp watts (W)   
Maintained efficacy, F M (lumens/watt)   
Section 6 Minimum Energy Performance Standards (minimum efficiency ) 
MEPS are mandatory for all tubular fluorescent lamps that are covered within the scope  of this Stan dard (see 
Clause 1.1). Detailed MEPS requirements are set out in Clause 4. 
Lamp nominal length (mm) :  ------------------  
Applicable MEPS levels  
Initial efficacy (lumens/watt ):  ………………………………………..[lumens/watt] (see Table 1)  
Maintained efficacy (lumens/watt ): ………………………………………. .[lumens/watt] (see Table 1)  
Rated/Tested levels  
Initial efficacy (lumens/watt):                 ………………………………………..[lumens/watt] (see Table ) 
Maintained efficacy (lumens/watt):       ………………………………………..[lumens/watt] (see Table ) 
Performance  prerequisite declaration  
Does this model comply with MEPS?                        Yes  
(Identify one)                                                                                   No  
Section 7 : Mercury Content  
Mercury present in fluorescent  
lamps det ermined in accordance  
with FDUS 903-2 Does not exceed 15 mg  
Exceeds 15 mg  
 
If exceeding 15 mg; specify quantity:  ------------------------------- mg 
Section 8 : Declaration  
I declare that the details stated above are true and correct in accordance with the  requirements of US IEC 60081  
Signature of Applicant: ............................................. Date: ....................................  
 
Office use only  
Date received:                                                  Registration number:  
 
 
 
 FDUS 903-1: 2011  
© UNBS 2011  – All rights re served  9 
 Annex  B 
(informative ) 
 
Summary test report for a tubular fluorescent lamp for MEPS  
This annex sets out the preferred format for a test report where the lamp is tested to US IEC 60081.   
Test Report o f a Tubular Fluorescent Lamp for Energy Efficiency   
(Please typ e or print)   
 
DESCRIPTION OF TUBULAR FLUORESCENT LAMP  
Brand name:   
Model name or family name (if available):   
Model number or family number:   
Batch number:   
Nominal length (mm)   
Nominal diameter (mm)   
Nominal wattage (watts)   
ILCOS code   
Country o f manufacture:   
LABORATORY DETAILS  
Test laboratory type:  
(identify one)  Own ‘in -house’ laboratory  
Independent laboratory  
Test laboratory name:   
Test laboratory location:  
(Identify one)   
Test laboratory address:   
Test laboratory accreditation:   
NOTE Laboratory details for each test to be included, where more than one laboratory has been used.  
TEST RESULTS  
Tests should be undertaken in accordance with US IEC  60081. Photometric characteristics should be measured in 
accordance with the relevant recomme ndation of the CIE (Commission Internationale de l’Eclairage)  
Initial lumens test   
Test report number:   
Test laboratory name:   
Date of test:   
Lamp batch tested:   
Test standard used  US IEC 60081  
Other -specify  
Reference ballast brand and model:   
Ballast supply voltage (V):   
Ballast supply frequency (Hz):   FDUS 903 -1: 2011  
10 © UNBS 2011  – All rights reserved  
 Highest recorded ambient temperature (°C):   
Lowest recorded ambient temperature (°C):   
Lamp supply voltage (V):   
Lamp current (A):   
Lamp input power (W):   
Initial luminous flux (lumens) (L):   
Initial efficacy F100 (calculated) (100 hours):   
Initial efficacy (calculated) (100 hours)   
Maintained lumens test   
Test report number:   
Test laboratory name:   
Date of test:   
Lamp batch tested:   
Test Standard used  US IEC 60081  
Other -specify  
Refere nce ballast brand and model:   
Ballast supply voltage (V):   
Ballast supply frequency (Hz):   
Highest recorded ambient temperature (°C):   
Lowest recorded ambient temperature (°C):   
Lamp supply voltage (V):   
Lamp current (A):   
Lamp input power (W):   
Maintained luminous flux (lumens) (L):   
Maintained efficacy FM (calculated) (5000  
hours):   
Colour rendering index (CRI)   
Test report number:   
Test laboratory name:   
Date of test:   
Lamp batch tested:   
Test Standard used:  CIE 13.3 —1995  
Other (specify)  
Reference ballast brand and model:   
Ballast supply voltage (V):   
Ballast supply frequency (Hz):   
Colour Rendering Index   
Mercury present in fluorescent lamp:  _________ mg  
determined in accordance with:  FDUS 903 -2, other -specify  
 FDUS 903-1: 2011  
© UNBS 2011  – All rights re served  11 
 Annex  C 
(informative)  
 
Energy efficiency class  
The energy efficiency cl ass of a lamp  shall be determined as follows:  
Lamps shall be classified in class A if:  
a) Fluorescent lamps without integral ballast (those requiring a ballast and/or other control gear to 
connect them to the mains)  
W ≤0.15 Φ + 0.0097 Φ 
 
b) Other lamps  
W ≤0.24 Φ + 0.0103 Φ 
where  
Φ is the lumen output of the lamp  
where  
W is the power input into the lamp in watts.  
If a lamp is not classified in class A, reference wattage W R shall be calculated as follows:  
WR ≤0.88 Φ + 0.049 Φ 
when Φ > 34 lumens  
where  
Φ is the lumen output of the lamp.  
An energy efficiency index EI is then set as — 
 
where  
W is the power input into the lamp in watts.  
The energy efficiency classes are then set in accordance with Table C1. FDUS 903 -1: 2011  
12 © UNBS 2011  – All rights reserved  
 Table C1: Ene rgy Efficiency  
Energy efficiency class  Energy efficiency Index E I 
B EI < 60%  
C 60 % ≤ EI < 80 % 
D 80 % ≤ EI < 95 % 
E 95 % ≤ EI < 110  % 
F 110 % ≤ EI < 130  % 
G EI ≥ 130%  
 FDUS 903-1: 2011  
© UNBS 2011  – All rights re served  13 
 Bibliography  
[1] US IEC 60081: Double -capped fluorescent lamps Performance spec ifications  
[2] FDUS 903-2: Procedure for quantitative analysis of mercury present in fluorescent lamps  
 FDUS 903-1: 2011  
© UNBS 2011 – All rights reserved  15 
 Certification marking  
Products that conform to Uganda standards may be marked with Uganda National Bureau of Standards 
(UNBS) Certification Mark shown in the figure below.  
The use of the UNBS Certification Mark is governed by the Standards Act, and the Regulations made 
thereunder. This mark can be used only by those licensed under the certification mark scheme operated by 
the Uganda National Bureau of S tandards and in conjunction with the relevant Uganda Standard. The 
presence of this mark on a product or in relation to a product is an assurance that the goods comply with the 
requirements of that standard under a system of supervision, control and testin g in accordance with the 
certification mark scheme of the Uganda National Bureau of Standards. UNBS marked products are 
continually checked by UNBS for conformity to that standard.  
Further particulars of the term s and conditions of licensing may be obtained from the Director, Uganda 
National Bureau of Standards.  
 
 FDUS 903-1: 2011    
 
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Price based on nn pages  
© UNBS 2011 – All rights reserved