Ok- I am talking about effective lumens, not total. 200W of the white light LED is producing 24,000 lumens, but there is no heat, so the plant canopy can be much closer to the light source. HPS lights (all light sources) are measured at 12” from the bulb. Most folks are probably keeping their top buds nearly 24” away from their 1000W HPS to prevent burning. At a distance of 24” those 100,000 drop to 25,000 lumens ( you need to divide by 4, that is the calculation. So if I am running two 100W white LED lamps (4000K spectrum), and getting 24,000 lumens at 12” is effectively very close to the same lumens.
Your claim of replacing 1000w hps with 200w leds is flawed for more than one reason in my opinion,
First, you are not going to get much coverage with 2 cobs, no where near the coverage you get with a 1000w hps and a big hood. You may get great results right under the cobs. I do too. Right under my 80w cob at 8 inches i am getting crazy good readings but the light intensity drops very quickly as you move the luxmeter. So the 600w led suggestion is more than anything about the coverage.
Second, never used hps and never will. Imho they have problems, high consumption, less than ideal spectrum, fire hazard etc. etc. but if you really want to add blue why not go with blurples than. Eventho i use true full spectrum lights now, i think blurples should be the most effective ones to grow plants. It is what they are designed for.
Above everything else, for me the most problematic thing about your claim is, you are still talking about lumens, which has nothing to do with growing. The lumens we measure is a deadzone for photosynthesis.
Now after all thats said and done, i think cobs or qbs can easily replace hps, mh, cmh etc. but you cannot get 4x4 or 5x5 coverage with 200w of cobs. That is the point i am trying to make. It is about coverage as much as it is about intensity. One of the mods, heisenbubble was doing some nice grows, comparing some of these to cobs. You may want to check it out.
Cobs with good spectrum are great and out doing these lights but with greater wattage than 200w. 600w can replace 1000hps nicely, no more no less and 40% savings is incredible for the environment and your bank account (on the long run :))
