dantastic wrote:

@Lost for Words, I'm not arguing your figures. But if we perceive a certain light as brighter, is it not brighter then?
Vision is a sense the same way as hearing is. There are frequencies the human ear can't hear and you can obviously measure "sound" some instrument makes and say one instrument is louder than another. But if I can hear one but the other is mostly outside the frequencies I can hear then the exercise is purely academic.

What I'm saying is, humans can't be 'measured' the same way. And if I perceive one light to be brighter than another then why isn't it? Are you saying that I can't see more detail in the "picture" in front of me even though I perceive the light to be brighter?

And if I can't - do I perhaps find it easier to see - even though I mightn't see 'more'?

Yes and no,I bought a "cool light" security light,it's emits the most hideous, harsh, poor light I've ever seen,you get arc light looking at the "bulb",but the shadows are ultra black,you couldn't read a wiring diagram under it either.Reminds me of ultra violet which isn't known as "the BLACK light" for nothing.
Regarding longevity,Osram NIGHTBREAKERS 110% have a bulb life of approx 400hrs.Nightbreaker 90% have a bulb life of 500-800hrs.My mates 110 bulbs lasted 12 months (both within a week of each other ),my ltd edition (gold plated ) 90% have been in 2 years....Kiss of death,lol. Pov.spec,ftw. 2006, 110,TD5.