Indoor 2700k Vs 4400k CFL For Flowering

[BrolyBuds]

Hi all. Cfl question here....as everyone knows..as far as growing with cfls go, the best choice is 2700k for flowering and 6500k for vegetative....However i came across this conversion table and the 6500k bulb has a nanometer wavelength of 445nm which for veg and blue spectrum is optimal...however when plugging in the 2700k and converting it...it shows it to be in the 1073nm area.. which sounds pretty funny...i just got done doing a grow start to finish with ALL 2700k bulbs and the thing came out beautifully and the harvest was very respectable as far as cfls go. So i can vouch for the 2700k bulbs..but according to this conversion chart the correct bulb for flowering would be a 4400k bulb....as it has a 658nm. Now i know the bulb has a more white light to it to the human eye but since plants see light differently im wondering if its just what the plant needs...looking at the peak chlorophyll absorption graph..the 658nm looks to be spot on the red spectrum.

One thing i am also curious about is that that site says "from a black body temperature...and i know that cfls don't use black body like other lighting types do. I should probably call and see where they get they're temperature rating from. Hopeing anyone can shed some light on this.

Thanks in advanced guys!






http://www.ajdesigner.com/phpwien/wien_equation.php

 

[fullauto]

Hey Broly,saw your thread and thought i'd pop in. I have a bluewidow photo going under 7 26 w daylight 55oo bulbs right now at day 70ish-it seems to love those bulbs as its gotten monstrous in the rubbermaid container its in. Another month or so i'll flip to flower bulbs and 12/12 and see what happens.

 

[BrolyBuds]

sweeeeeeeet. Post the link man..i'll deff check it out. I'd be curious to see them under that spectrum...i also went the multiple small cfl route and was very pleased. 10 23 2700k cfls. 1 plant. Check it out bro

https://www.autoflower.org/f43/brolys-closet-grow-speed-devil-2-harvested-6032.html

 

[fullauto]

Its listed in the photoperiod grow thread rubbermaid blue widow giant in the box. Checked out your link and that is an awesome grow man!

 

[BrolyBuds]

thanks dood. and yea your blue widow looks to be coming along nicely ;]...cant wait to see the finished product!!!!

 

[BrolyBuds]

This is a GREAT in depth conversation on this exact question

http://forum.grasscity.com/advanced-growing-techniques/508951-hunt-best-bulb-bring-sun-inside.html

i believe the only step now is to find out how CFL manufactures calculate and label the temperatures of there CFL's ....IF they just look at a 4400k bulb and compare it to a black body radiated surface and then say ok its this temperature...then the 4400k rating would be irrelevant to the formulas out there, BUT if there is a more scientific and exact way to it then i would wager and even be willing to do a comparison grow between the 2 temperatures.

 

[BrolyBuds]

according to GE. The CCT is extremely close and almost the same as an actual kelvin temperature from a black body surface. Calculated from an industrial light meter.

based on this info...im going to soon be doing a side by side comparison grow. Same Everything. 1 with 8 2700k and 2 6500k CFLS and the other with 8 4400k and 2 6500k cfls. I had stated in another grow my setup. But im about half way done with my project..basically im going to have 10 hand made enclosures. Each are 1x1', have 4 60mm fans ( 2 for induction and 2 for exhaust ), with single pane glass covering it. Each compaison will have EVERYTHING the same except for the flowering bulbs.