linderstein
Well-Known Member
This pcb need heatsink at 120w.
If, and when, I do another order of the boards I have I'll send you one too.sure ill test it, just pay shipping both ways, pm me for addy
But do we know which company this is? I don't see that info mentioned here....manufactured by this company.
A "good" PAR meter... there are many meters that are junkWe really need some guys with PAR meter...
One (cobkits) is not enough. I don't trust to only one.
I currently have boards with similar spacing between the LEDs and so far none are needed. I keep a fan running on the plants placed in a way that it blows over the boards. There is a small fan at the top of the tent pulling warm air out. I keep the bottom of the tent cracked a bit and air flows past the boards on the way out. If after getting this going I find they are getting too hot at the power I'm running them I may have to add some sort of heatsink.@chuckduck why don't you think you need a heatsink?
I use cheap aluminum U channel from a local metal supply to make inexpensive heatsinks.I currently have boards with similar spacing between the LEDs and so far none are needed. I keep a fan running on the plants placed in a way that it blows over the boards. There is a small fan at the top of the tent pulling warm air out. I keep the bottom of the tent cracked a bit and air flows past the boards on the way out. If after getting this going I find they are getting too hot at the power I'm running them I may have to add some sort of heatsink.
Do any diodes produce 90CRI?nice boards, did u get them in 3000k 90CRI
http://rollitup.org/t/dhp-presents-citizen-cob-1812-3500k-80cri-vs-1812-3500k-90-cri.932990/Is there a noticeable difference between 80cri and 90cri, in terms of yield or bud density?
personally I would move the center 2 out to the edges so the 8 boards form a 3x3 square minus a board in the center, like a square donut.. that will give you the most even coverage with no hotspot..The frame of the light will be 4x4 and I will fit all eight of them in that frame.
i would as well, there will be lots of overlap in the center already. or use 9 or throw some cobs in the middlepersonally I would move the center 2 out to the edges so the 8 boards form a 3x3 square minus a board in the center, like a square donut.. that will give you the most even coverage with no hotspot..
So if I read that thread right, looks like the only real noticeable difference is that the 90cri is about a week less flower time to harvest. For a lot of people that might be the right choice!
I can't speak for @The Dawg but this little exchange seems to summarize his feelings about 80 vs 90 cri..So if I read that thread right, looks like the only real noticeable difference is that the 90cri is about a week less flower time to harvest.
As You Can See The 90 Cri Is Once Again Steppin To Da Plate And Biotch Slappin The 80 Cri
With COBs it's all good but that 90 cri red shift is significant. ...
I Agree I Love My 90 Cri Lamps But I Wouldn't Go Out And Trash Your 80 Cri Lamps As Their Great Producers Also
So it looks like it does provide slightly better yield too.I can't speak for @The Dawg but this little exchange seems to summarize his feelings about 80 vs 90 cri..
ya mostly, aside from the grow in that thread which was 3500K..The Dawg grows some dank ass nugs. And with 4000k and 5000k spectrums only???
The 4000k 90 Cri Is My Favorite Spectrum
Brother I'm An Old School MH Grower From The 70's. HPS In My Book Stands For Hot Piece of Shit. Yes The 4000k Has Always Been My Favorite Spectrum To Grow With. Below Is My 5x5 Which Consist Of 2 4000k 80 Cri And 1 5000k 70 Cri Plus I Just Found An Old Cmh Sleeve. The Reason I Run 90 Cri's is I Want The Extra Bump In The 630-660 Range Through Out My Grow
I Prefer The Upper Kelvins Not Only Because Of The Frost They Produce But To My Nekkid Eye My Plants Look Healthier
nope. if you use a meter to test, you will find the opposite... the crossover from the other boards will light the center evenly if you leave an empty space there. conversely, if you put a board in the center the crossover from the other boards plus the light from that board will create a hotspot in the centerThat would create a 24"x20" space in the middle, the middle of the canopy would be seriously lacking par..