Any Tests Done w/ Flowering with 6500k Lights?

**yorban** · 10-14-2009, 08:23 PM

Hey, I have a 290 Watts of 6500k CFL, actual wattage, and about 138 watts of 2500k. If i were to flower 3-4 plants under these lights would I see a major lack of buds because my main source of light is the 6500k? I was wondering if there were any tests between 6500k and 2500k for vegging and flowering, where each wavelength was exclusive to a plant. If not someone should try that out for the hell of it.

**phreakygoat** · 10-14-2009, 08:32 PM

you will get less yield and density with that mix, it'd be way better if it were switched. almost all 2500k is best...

**findme** · 05-29-2011, 10:50 AM

update: how do u know 2500k is the best?

**ColoradoLove** · 05-29-2011, 10:53 AM

No one is testing different CFL spectrums because they're not that great for flowering...

**tnelsonfla** · 06-10-2011, 03:17 PM

I would suggest 5000K & 6500K for your vegging cycle,.. sure you could add a few 2700K in the mix, no more than 20% of your light coming from less than5000K. But for flowering I would increase wattage by atleast 25%. Then I would make sure your light ratio is 85%/15%...with 85% wattage is 2700K and few 5000K/6500K in the mix if you chose. PLEASE: Avoid 3500K-4500K, it adds no benefit to your plants!

**High Time 420** · 06-12-2011, 07:46 AM

Originally Posted by ColoradoLove

No one is testing different CFL spectrums because they're not that great for flowering...

I bet without looking though your RIU page that you wasn't using them in a small space or wasn't using them efficently, if you have used them at all.

And of course cfl spectrums have been tested.

**mouthmeetsoap** · 06-12-2011, 08:13 AM

I flower with a primarily blue bulb with added red spectrum and I will NEVER go back to a plain HPS again. Of course I use HID lighting rather than cfls, but the difference was not even close. My nugs were more dense and more crystally then with the plain red bulb, and it also seemed to affect the overall look of the plant. The nodes were tighter and the foliage more green. Blue spectrum is much closer to the natural sunlight than the 2700 k bulbs. It's unbelievable how many people recommend against blue spectrum in flower. You'll never know until you try.

**mijola3** · 06-12-2011, 09:42 AM

Originally Posted by mouthmeetsoap

I flower with a primarily blue bulb with added red spectrum and I will NEVER go back to a plain HPS again. Of course I use HID lighting rather than cfls, but the difference was not even close. My nugs were more dense and more crystally then with the plain red bulb, and it also seemed to affect the overall look of the plant. The nodes were tighter and the foliage more green. Blue spectrum is much closer to the natural sunlight than the 2700 k bulbs. It's unbelievable how many people recommend against blue spectrum in flower. You'll never know until you try.

i totally agree, i have flowered with only t-5 HO small tubes, the little 24 watters or whatever,they are "daylight" which i think is 6500 K, and surprizingly enough the buds were looking fantastic. you've gotta check out some Ceramic Metal Halide grows on here, thats a higher K spectrum than HPS i think and it produces awesome buds. something about that "natural" spectrum of light.....i dunno.....

**locdawg** · 06-12-2011, 01:49 PM

IMHO I feel that growth through the flowering state can be used in both spectrum's, my last grow I used majorly red spectrum of light for flowering(2700k) and I got what I would state to be slightly to not too much noticeable difference in growth from the same strain I am now flowering, with mostly blue light(6500k 4-14w cfl) i might add that the blue light seems to be doing a wonderful job at an earlier stage then the red light, so maybe blue light is better??? more likeness to the suns natural rays??? I am in no way saying that this is conclusive data, or enough empirical data to say that my findings are absolute truth. however for me a "backyard scientist" the data tells me that at least when considering light levels and types of light, the cfl light seems to grow semi-cosistantly between the two most popular spectrums(6500k-2700k) I have tried this grow and previous grow. I also read on another forum last night when this exact subject was the topic, one really smart collegiate level botanist stated that the plants genes are going to be the bigger deciding factor in the "airyness" or "density" of a bud. the grower only need to present the plants with enough or sutable amout of light I.E. lumens and the plants genetics should do the rest. his statement and my personal trial experiments lead me to believe he is right... but who knows.

dont know if that helps but thats is just what I have found in the research I have personally done in my own garden with my own two hands/ I say that to say if you have a question like that in which you pose to yourself or others. The best bet... at least for one who is scientifically interested in learning more about the plant he/she cultivates, is to just dive in a do the experiment yourself. your hand gathered data is always going to be better then the info given by someone who is only giving an "educated guess" or "speculative judgement" being that they may not have personally tested the said variable in their own garden. just my humble opinion but i suggest to try it yourself. Forums are good for a lot of things but nothing beats out eperimenting on a tangable level.

Locdawg,

"Stay Faded"