Instruction: Output yes if the supporting document can answer the given question. Otherwise, output no.

Input:
Question: Is the screw in base included in the 6 1/2" length of these bulbs ?
Document: After wasting hundreds of dollars buying brand-name and non-brand name CFLs at the likes of Menards and Home Depot I came across these bulbs on Amazon and finally ordered some. My issues with CFLs in general are: 1) take a long time to light up; 2) color is too white; 3) dimmable performance; 4) cost.These Purespectrum bulbs are the best I've bought so far.
PureSpectrum 20W Fully Dimmable Spiral CFL(2 Pack) 2700K 6000 hours (75W Equivalent)- I bought 6 bulbs (3 packages of 2 per package) and, by the time I had the chandelier's glass bowl lowered to accommodate the large size of the CFLs, I discovered that only 3 out of the 6 actually worked while the other 3 refused to even flicker.I heartily encourage anyone thinking of using these CFLs to save your money and buy dimmable CFLs elsewhere.Sorely disappointed.
I have four installed in a fan-light combo--the last of my household incandescents. Some reviews had me worried.1)The lights dim quite well. They don't yellow as incandescent lights do. I observed no noise at low settings.2)As expected, they use less than the full travel of my dimmer switch slider before they extinguish.3)They do seem to be a little bit taller than standard CFL's--so they stick out of my lamp shades a little.
I've had these bulbs in my house for a few monthsthey light right away no waiting like most CFL'Sand they dim fairly wellunlike most dimmable  bulbs I have tried and  throw awayI just wished they sold in a larger pack 6 to 8 per packbut their still worth the price paid
SummaryYes they dim, but not perfect. Sort of like a digital dim, its not smooth. Also, at low dim level they don't work well at all. They flicker at really low levels. Another reviewer said a low of 25% is the limit, that sounds about right. Some of the bulbs made a buzzing noise when dimmmed. Not sure why.I ordered 6, 4 arrived broken in the box.
I bought these to use in a dimmable ceiling fan. Unfortunately, the bulb is so long that they stick out from the end of the fixture shades. So I don't use them in the ceiling fan, but instead in a light fixture where the length won't be a problem. They give nice light, and are dimmable (which many CLF bulbs are not), so I'm glad I have them. I will have to keep looking for bulbs for the ceiling fan, though!
The width is about equal to a standard bulb. If you can live with the extra length, I would highly recommend this CFL. :) ken
Great price for 2 pack of dimmable fluorescent bulb. My hardware store carries similar single dimmable bulbs for the same price. With this purchase i get two. Great deal.
I bought a pair of these a few weeks ago, and I'm about to buy another. They dim to about 1/3 power before flickering. The noise produced while dimmed is comparable to that of incandescents.
Instant On. Doesn't buzz. Dims down to around 10-20%. Maybe a little longer length than a standard incandescent - as long as this isn't a problem, this is the best dimming CFL I have found.
Answer: yes