Led lights

For 500-600 euros you can likely diy something nicer than what you can buy, if willing to wire things and such. Here's a few things to compare umol/J (umol/s per j/s) This will tell you efficacy. If it isn't 2.5 or greater, move along.. you should easily clear this value. Some can reach 3, but that'll be a white-only diode most likely. How many hours before it reaches 80% intensity. If they leave off the 80% intensity part, assume they are bullsh%$#tting you with bullsh%$t information.. like 50% intensity at 50k hours, but after 10-15k it's a turd bucket too. Between these two things you can do the algebra to show that those cheaper led are not so cheap after just 1-2 years and you have to replace them every 2-3. Anything with a base Samsung LM301B diode (or lm301H, but don't pay for the "h") will be the most efficient and a long lasting light - 50-60k hours before 80% as long as it has good heat dissipation. you'll want some reds mixed in, but i wouldn't count something out just because it doesn't have uv or ir. Heat dissipation will be how you separate the good LEDs with efficient diodes from the bad ones. If they don't take care of heat, you lose efficiency.. you lose the cost savings.. you lose longevity... QBs can be a bit warm because of so many concentrated. strips can reduce that and still provide a blanket of coverage. bridgelux EB-series, i beleive? something you can DIY yourself and ensure you get quality. That would be an example of a strip -- like the Zeus light that migrow recently rated... that's 2.5? 2.4 efficacy? my curiosity would be the hours before 80% intense and heat dissipation. Take this info and you can be certain to pick out the best option for your money.