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Just build your own using Citizen or Vero COBS (not cree, they are overpriced), you will get much better price and overall efficiency.

Great thread, although I see the word CREE used too much. In the last year or so Vero and Citizen are offering better COBS for cheaper price. The only way CREE can continue to compete is to lower the prices... Pointless spending $50 on a CREE when a $30 vero 29/Citizen can do the same -/+5%

lol if led, hps, and t5 all provide the same kelvin spectrum, why do you think you will get any worthwhile results?

Power efficiency & space efficiency. HPS requires more space to grow in, where as T5 and LED do not. There maybe benefits of light mixing, but I dont think it would be of any significance to warrant doing it. More straight forward to keep things simple.

What t5 bulb brand and wattage do you use? 6k per cubic ft seems great. Because most lighting is chosen based on price, efficiency, and grow setup. Running HPS usually requires extraction fans to be ran at a certain level, running LED allows extraction fans to be ran much slower, thus saving...

LEDS blow away T5s but as T5's are much more common. T5 to my memory give around 80-100 Lumens per watt. LEDS offering 160-210 Lumens per watt.

I have been researching for the past few days LED COBS, CREE, Vero, and Citizens. Read/learnt alot from users like fanleaf, Supra, BuddyColas, JorgeGonzalez, Rahz, Bobby_G, etc I came to the conclusion after many hours that the Citizen CLU048-1212C4 seemed my best choice. At $11 each I favoured...