afrawfraw, you're kind of a troll dude. while this thread title was a bit trollish as well, i'm just stating what I see
you post that fact sheet about LED lifetimes..."bearer of bad news" etc whatever
If you don't think 70% quality of light after 30,000 hours ( 3.5 years of 24/0, 7 years at 12/12 ) is a deal killer, then please go troll somewhere else, because all lights degrade significantly at first, and then slowly degrade. LED still are far far far ahead of anything else. If anything, the power supply or something will fail before the LED fail.
secondly, how in all that is holy can you say what i posted is not useful.
finally, lumens life etc would be the same as any other LED, or close enough it doesn't even merit discussion.
Fuzzy: notice how I said supposedly? I was reading something from 2007. Also, not that many UVB LED are even needed, only 2% of total light! An expensive LED is like $1/each. Also, don't forget about exhaust fans, and all the wasted heat energy from HID.