nfhiggs
Well-Known Member
You really can't compare the lumen values of two very different light sources. The spectrums vary way to much to be able to equate them. You would have to convert each to μΜol/s/m² then compare. Another thing to consider is that the 800 lumen rating of the bulbs is WITH the diffuser in place. Once the diffuser is removed you have no losses from it, and all the light is now directed downward in a 120-150 degree spread, instead of a 360 degree spread.These 3 bulb units would work great in my planned fixture. Could have 33 bulbs going with enough spread to give a footprint at least twice the size of the actual fixture. 33 x 800 lumens = 26,400 which is about half what a 400W MH puts out but using 33x9W= 297W. Suddenly doesn't seem like the best way to go.
I just want my unit to veg little guys enough to put them under a 400 without wasting light not hitting greenery. I see guys sprouting 4 little seeds in solo cups under 600s and think what a waste when a couple CFLs would do a great job for the first couple of weeks. If light is hitting the floor it's wasted.
If I'm just doing a few clones I can screw in a few bulbs instead of running all 11 so I can just use as much as I need for the job.
Thanks again for the input!
I'd be willing to bet if you put a lux meter underneath both lights you'd find much more even illumination with better depth penetration under the LED bulbs than the 400W MH bulb.