I would like to avoid too much early stretch, as the girls cannot get much taller than 4 1/2 feet from top of soil, when flowering is complete. I do plan on some moderate l.s.t, to keep them fairly short to max out yield and even out the canopy. My flower K rating of the same model is 3500K. Anyone have some thoughts on this? Would be much appreciated.
CXB3590 6500K, 5000K, or 4000K for 4-5 week veg, with moderate LST?
- Thread starter juq
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- 6500k 5000k veg cxb 3590
CobKits
Well-Known Member
from my experience 5000K leds do great in veg and early flower and keep them pretty short. ill be experimenting with 6500k led soon
i think there is enough of a difference between the 'spikey' spectrum of a fluorescent and the 'smooth' spectrum of a phosphor LED that 4000, 5000 or 6500K may act differently for a given color temp in fluoro vs led. further research is in order.
i think there is enough of a difference between the 'spikey' spectrum of a fluorescent and the 'smooth' spectrum of a phosphor LED that 4000, 5000 or 6500K may act differently for a given color temp in fluoro vs led. further research is in order.
weed-whacker
Well-Known Member
in this case I would add some blue monos, they are very vey efficient and will do what you want
https://www.fasttech.com/products/2119704
https://www.fasttech.com/products/3587201
of course u can find them elsewhere or u could go with a 6500k cob on its own driver that you can add in during that stage
https://www.fasttech.com/products/2119704
https://www.fasttech.com/products/3587201
of course u can find them elsewhere or u could go with a 6500k cob on its own driver that you can add in during that stage
VegasWinner
Well-Known Member
Thanks everyone for the replies. I am planning on a 2x2.5' area for veg only. I need high efficiency so going to drive 6 cbx3590's at only 700mA, with 1x HLG-C120B-700mA meanwell driver. At full power this will give me at least 700 PPFD, which sounds like that is all you want for veg. Of course I will also hook up one 100K pot to dial it down when needed. @CobKits Yeah my guess was that the 5000K's would be likely be just enough stretch for the job, judging by what the 3500K did for some of the vegging I did with them, so I think this will be my choice, thanks for your experience imparted to me on the question. Any mono color cree chips I use, will be for far red setup to help them sleep faster.
I am totally loving every aspect save the upfront cost of running many cobs very soft (700mA). I have been able to buy smaller 105mm pinned heatsinks that require no active cooling and still have quite a bit of heat sucking ability to spare. These little things only heat up to about 125 F with 0 airflow, but with decent airflow they are barely warm to the touch. The best part is I will see nice HVAC savings with this high number COB setup, which will help recoup the cost of the extra heatsinks and cobs over time, as will running the COB's at about 64 percent efficiency, if not more due to what seems like a really low temp junction. Another nice benefit is I don't seem to have any hot spots with my layout and a super even 900ish PPPD spread threw out. I am seeing no light burn with the angelina reflectors on, even only 14-15" from the canopy in some spots. The setup I am talking about has 22x 3500K cxb3590 CD bins, with 2x hlg320B-700mA meanwells, each one driving 11, on a frame that is 43x43x5", almost filling up a 48x48" space. The light is fairly heavy at about 65 pounds with this mass of cobs, heatsinks and L- aluminum frame, and this doesn't count the pair of drivers which are remote mounted to help with heat issues inside space. In the middle portion of the light I spaced the COB's further apart, and tighter along the edges to assure that the middle didn't have hot spots and it was a success. Just make sure you ground everything properly if you use these big nasty drivers, 428v each sounds a bit rough on the heart.
I'd like to send a shout out to @robincnn and Northern Grow Lights for providing these great little 105mm heat sinks for my soft run setup, at good prices. The were all perfectly predrilled/tapped saving me the substantial work/trouble of doing it myself. All of them arrived quite fast and perfectly packed with all the screws I needed to mount the Ideal holders and Angelina reflector holders, along with mounting the heat sinks themselves, and even some eyehooks/nuts I used to hang it with. Thanks a ton!
I also want to send a special thanks to @Growmau5 . You are truly an inspiration to me and it appears countless others. Your super chill and zen like style along with your knowledge and smarts, have been awesome to behold. Thank you so much for what you do for all of us DIY'ers!
I am totally loving every aspect save the upfront cost of running many cobs very soft (700mA). I have been able to buy smaller 105mm pinned heatsinks that require no active cooling and still have quite a bit of heat sucking ability to spare. These little things only heat up to about 125 F with 0 airflow, but with decent airflow they are barely warm to the touch. The best part is I will see nice HVAC savings with this high number COB setup, which will help recoup the cost of the extra heatsinks and cobs over time, as will running the COB's at about 64 percent efficiency, if not more due to what seems like a really low temp junction. Another nice benefit is I don't seem to have any hot spots with my layout and a super even 900ish PPPD spread threw out. I am seeing no light burn with the angelina reflectors on, even only 14-15" from the canopy in some spots. The setup I am talking about has 22x 3500K cxb3590 CD bins, with 2x hlg320B-700mA meanwells, each one driving 11, on a frame that is 43x43x5", almost filling up a 48x48" space. The light is fairly heavy at about 65 pounds with this mass of cobs, heatsinks and L- aluminum frame, and this doesn't count the pair of drivers which are remote mounted to help with heat issues inside space. In the middle portion of the light I spaced the COB's further apart, and tighter along the edges to assure that the middle didn't have hot spots and it was a success. Just make sure you ground everything properly if you use these big nasty drivers, 428v each sounds a bit rough on the heart.
I'd like to send a shout out to @robincnn and Northern Grow Lights for providing these great little 105mm heat sinks for my soft run setup, at good prices. The were all perfectly predrilled/tapped saving me the substantial work/trouble of doing it myself. All of them arrived quite fast and perfectly packed with all the screws I needed to mount the Ideal holders and Angelina reflector holders, along with mounting the heat sinks themselves, and even some eyehooks/nuts I used to hang it with. Thanks a ton!
I also want to send a special thanks to @Growmau5 . You are truly an inspiration to me and it appears countless others. Your super chill and zen like style along with your knowledge and smarts, have been awesome to behold. Thank you so much for what you do for all of us DIY'ers!