SWMBO'd wants a good, bright, daylight quality, light source for
doing needlework. This is to fit into a magnifier angle poise type
lamp with E27 base with not much more space than a normal GLS takes.

I've pointed her at seeing how the bog standard CFL's we have or a
3000 K LED stand up. She couldn't really detect any difference in the
colour rendering(*), light level was the main complaint, not enough.
I was thinking the best bet would be one of those "daylight" (aka
blue tinted) 60 W tungsten GLS bulbs but she has
found:

http://www.lightbulbs-direct.com/t2-...y-saver-20w-es
/p3334/

Reasonable level but are the claims about colour likely to be
accurate? I'm not sure what the "Finish 865 - Daylight" means in the
spec list. Is that related to the three digit number that has
something to do with colour temp and/or CRI?

(*) They look very different through a basic spectroscope. The LED is
amorphous from red to green a small gap then a blue/purple band. The
CFLs have 4 distinct bands red orange green purple.

--
Cheers
Dave.