B

- i APPENDIX B. ENERGY USE CALCULATI ON

TABLE OF CONTENTS

B.1 INTRODUCTION

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B.2 R20 SHORT LAMP ENERGY USE

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- 1 APPENDIX B. ENERGY USE CALCULATI ON

B.1 INTRODUCTION

This appendix provides the U.S. Department of Energy’s (DOE’s) calculation of energy

use for 100 watt (W) R20 a short (having a maximum overall length (MOL) of 3 and 5/8 (or 3.625) inches) lamps (hereafter “ R20 short lamps”). Specifically, DOE used estimates to assume the installed stock of R20 short lamps and the 2010 U.S. Lighting Market Characterization ( 2010

LM C) b to develop average annual operating hours. DOE determined the annual energy usage of R20 short lamps to be insignificant. The process is explained in greater detail in the following

section.

B.2 R20 SHORT LAMP ENERGY USE

DOE found that approximately 2,352,000 inground pools and spas use lighting in the United States, based on information provided by the National Association of Pool and Spa

Professionals

. c However, this does not reflect pools and spas that specifically use R20 short lamps. The National Electrical Manufacturers Association (NEMA) submitted lamp

manufacturer data that indicated t here are over 5,000,000 existing pools and spas installed in the

United States that must use R20 short lamps due to their existing fi xture design and safety requirements. (NEMA, No. 7 at p. 2) d DOE selected NEMA’s more con servative estimate to

assess the installed stock of R20 short lamps

.

DOE used the 2010 LMC to estimate usage of the R20 short lamps . Because the LMC has

no estimate for the operating hou rs of a pool or spa, DOE used the estimate that most clos ely represented this category. DOE determined that t he average daily operating hours for the Other/Unknown room type for the Single Family Detached Home reside nce type are the mo st applicable usage assumption for R20 short lamps. Therefore, DOE assumed average annual operating hours of 365 hours ; this figure corresponded with feedback DOE had received on R20 short lamp usage. DOE also learned through manufacturer interviews that o nly one R20 short lamp is typically installed in an inground pool or spa. DOE then used these assumptions , along

with the rated wattage of 100W, to calculate that R20 short lamps installed in the United States

use an estimated 0 .0006 quads of energy per ye ar.

a “R” denotes a reflector lamp type and “20” denotes diameter in 1/8 inch increments, which translates to 2.5 inches.

b U.S. Department of Energy, Office of Energy Eff iciency and Renewable Energy, “2010 U.S. Lighting Market

Characterization. ” Available at: http://apps1.eere.energy.gov/buildings/publications/pdfs/ssl/2010

- lmc

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2012.pdf

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c In an interview conducted January 18, 2012

. d A notation in the form “ NEMA, No. 7 at p. 2 ” identifies a written com ment that DOE has received and has included in the docket of this rulemaking. This particular notation refers to a comment: (1) submitted by the NEMA ; (2) in document number 7 of the docket; and (3) on page 2 of that document.