Supplemental light for flower (6500k or 5000k?)

I have two spare CFL's - a 150w 6500k and a 150w 5000k that I am currently not using. I'm in the flower phase and in theory could fit another light in, but would either of these spectrum's provide ANY benefit vs. the cost of the electricity they would consume.

Thanks!

Less effective spectrums, comparative to, say, 3000k, 3500k.

Olive Drab Green said:

Less effective spectrums, comparative to, say, 3000k, 3500k.

Click to expand...

Right, but that didn't answer my question, I'll be clearer. One plant is under 150w HPS, the other is under 150w 2700k CFL. I can get one more light, tops, in there right in between them. I have several 150w 6500k and 150w 5000k CFLs. I only use the 6500k's, though. The 5000k came with a hood I bought.

They are Auto's and showed sex at three weeks, they are on week four now. I'm asking if it's worth the trouble to add another light (either 6500k or 5000k), and if so, does one spectrum have any advantage over the other at this stage.

Another light is going to increase the heat and add to the electric bill, and I have no idea if it's going to even increase the yield.

Thoughts?

I can't answer to all the details of your question, but I do add the 5000k until like the 6th week then switch to 6500k or at least that's my plan . I'm running 600w hps in flower now with 5000k side light in about two weeks I'll switch out the 5000k for a 6500k. I have been reading up on finish lighting and that is as good as I can do for now. Good luck

I want to vote for the 5k... Mixed spectrum is always good in my non scientific opinion... How many lumens per sqft do you have now without the extra bulb?

The tent is 60" tall, 48" wide, 24" deep. The HPS puts out 16,000 lumens. I don't know what the CFL puts out (a conservative estimate is between 9,200 and 10,200, per my research). The 5000k CFL puts out 8000 lumens.

I also just got my hands on a 36w LED Grow Light (12 3w LEDs, 3 blue & 9 red - 460nm blue light, 660nm red light) with an aluminum light reflector. I know nothing about LEDs or LED growing, but for free?? Hey, why not, I'll figure it out! I've got a nice spot I can clamp it on a pole, but I need to do some reading on distance placing first.

Anyway, sounds like the 5000k might be a good one to supplement with.

Add both if you can. Blue is fine in flower. The more spectrum you can add the better.