My green leds gave up. I have already ordered more, but it will be another month till I get to try again. I'm just posting so you know it's happening. In a stainless kitchen pedal bin, which should make a nice reflector and a reasonable seal. Though it will be in a dark place to.
I have chosen 20w as some red&blue will still be radiated regardless. Unlike some, I believe 730nm is above 700nm and as such infra-red energy. Emitted by any warm item. I need to reduce the out of band radiation all I can, or this will be pointless.
I know from repeated experience, a plant turfed out a tent into a dark room will last about 5 days before obvious leaf clue's appear. That's with opening said tent daily. Lightening at the base of the leaf, like sulfur or iron, or cold nights into flower occurs. Which with half hours light a day, perhaps makes sense.
So, I have expectations and the kit almost to hand. Maybe I should do a separate thread and link to it here though. As it's already a few posts that may just be clutter here.
On a brighter note, I got a 20w green led on an 80mm2 heatsink, for under a fiver
(though radio reception in the area will probably suffer)