I have about nine thousand lumens of cfl on three plants. They are young. I have 5 26 watt 6500K Daylight cfls and one 2700k 42 watt cfl I have another 6500k daylight bulb I am not using, should I take the 2700k 42 watt out and put the 26 watt daylight in? That would give me all 6 bulbs of daylight type. Am I wasting the 42 watts of power using that 2700k while they are in Veg? I hate the thought of that 42 watts being a waste of money, when I could give the plants an extra 26 watts of Daylight bulb. It would cost less, and the daylight would give off less heat as well, since it's only 26 watts.

Thanks

i wood ceep it the way it is. i have 2 or 3 2700k in veging

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Actually, I like the fact you responded, but this really doesn't answer my question. All this does is tell me that we both might be making a mistake. here is the question reduced, because there has to be a proper answer.


The question is: Will a plant in veg get more light it can use from a 26 watt 6500k daylight cfl than it could from a 42 watt 2700k warm color cfl?

the 6500k cfl would be the best for veg the 2700k better for flowering

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Use all 6500k for vegging and 3000k and lower. the lower the better for flowering cause 3000 -5000 is around the white light zone kinda in the middle. 6500k ideal for vegging lots of blue lighting. and 3000k -2500k is red lighting ideal for flowering. CFL god

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Its good to have a few 2700k in there as plants still do need some red spectrum in vegging just not as much.

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for vegging you should only use 5500-6500K bulbs, since you veg with cfls you should only use 6500K.

those 2700K are for flowering suited but not for veg.

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Use that color chart to your avatanage, remember veg u need lots of blue and flowering you need lots of red. so for CFL red spectrum u want the Kalvins to be the lowest number and for CFL blue psectrum u want the Kalvins to be the highest number (6500k for veg, 3000 - 2500K for flower)

Hey all

I recently did some research, consulted my botany texts, and found out about 'weins' law.

Check it out:


"there IS a relationship between a colour temperature and the peak wavelength in its spectrum. It's called Wien's law.

Wavelength (nanometers) = 3,000,000 / Col temp (Kelvin).

So at 4,500K, the peak wavelength is 666nm (red) at 6,000K the peak wavelength is 500nm (bluish green) and at 7,500K the peak wavelength is 400nm (deep blue)"



Ok, given 'weins law', and knowing the wavelengths that chlorophyll A and B function at, we can figure out the best color bulb to use

Chlorophyll A: absorption peaks at ~440 nanometers (blue) and ~660 (red)
440 nanometers = 3,000,000 / 6,818K
660 nanometers = 3,000,000 / 4,545K

Chlorophyll B: absortion peaks at ~470 nanometers (blue) and ~640 (red)
470 nanometers = 3,000,000 / 6,382K
640 nanometers = 3,000,000 / 4,687K



Now...I have supplied us with the most useful kelvin values for chlorophyll A and B, but as for what is needed in vegging vs flower I cannot yet attest to. I've always heard blue for veg red for flower, and it seems to work for everyone, so I dont doubt it.

The only place i'm seeing a departure from popular wisdom is the kelvin values for the red, flowering light. 2700 is way off from the red absorption peak, the best value we can look for is ~4,600K (or so these numbers are telling me).

I'm planning on 4 or 5 105watt CFL's @ 6500K for veg, then switch them all to 105watt CFL's @ 4100 (or possibly 5000K, i'm still deciding) for flowering.

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