mix 2700+3500 or 3500 only bxeb diy bridgelux build

2cent

2cent

Well-Known Member
Hey yall am going to make a bridgelux strip light. Origionaly i was going to use gen3 with a 3000k and 3500k mix 14 of each 900w total.

But stock has hammered me allover im even importing. I wanted 90cri but its not avalibe so im 80cri ofc.
3500 80cri x28 was my final decision. Then a pal linked me a bloody 90cri avalible....but its in 2700k
2700 90cri


Would you mix aslow as 2700 to get red and 90cri? 14x3500 and 14x2700
Or stick 80cri on 3500 all the way

Whats ur thaughts and why redy to order and hesitant. I just know if i order 1 someone wil be like noo ya shuda got this.. face palms
 
HydoDan said:
Do you plan on vegging with it, or just flower?
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Well i start cuts under t5 and seeds. And i start em week 4 flower redy for chop.
So i move them in as plants with rootballs. And veg into a scrogg for 3 weeks
 
HydoDan said:
I would build a two channel light.. Veg under the 3500k then when you flip turn on the 2700k..
900 watts is going to take multiple drivers so it should be pretty easy.. Something to think about..
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Prettymuch how i would run it anyways yeah and each on their own dimmer
Bring the red in eh
 
2cent said:
Prettymuch how i would run it anyways yeah and each on their own dimmer
Bring the red in eh
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I wouldn't be scared to run the 2700 at all even in veg.

I mean people veg with HPS ~2100K no problem.

And those 2700K strips still have like 35% blue which is around 3X as much blue as HPS has.

also if I was gonna cross the 2700K with anything it would be 4000K for veg and for the fact the 4K strips are more efficient and would give a little efficacy boost to the fixture when running on full blast.
 
MidnightSun72 said:
I wouldn't be scared to run the 2700 at all even in veg.

I mean people veg with HPS ~2100K no problem.

And those 2700K strips still have like 35% blue which is around 3X as much blue as HPS has.

also if I was gonna cross the 2700K with anything it would be 4000K for veg and for the fact the 4K strips are more efficient and would give a little efficacy boost to the fixture when running on full blast.
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2700k 90cri is not 35% blue, it's about 11%.
 
MidnightSun72 said:
Sorry my bad. Am I misreading this chart?
View attachment 4981711
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yes you are reading it wrong...relative intensity is not the same as percentage of spectrum. you got to look at it like dyno plot, its all about the area under the curve...

see my professionally edited pic...

InkedScreenshot 2021-09-07 at 13-13-26 mix 2700+3500 or 3500 only bxeb diy bridgelux build_LI.jpg

if you look at the blue part of the spectrum and compare its area to the rest of the spectrum you can see its around approx 11%.
 
grotbags said:
yes you are reading it wrong...relative intensity is not the same as percentage of spectrum. you got to look at it like dyno plot, its all about the area under the curve...

see my professionally edited pic...

View attachment 4981758

if you look at the blue part of the spectrum and compare its area to the rest of the spectrum you can see its around approx 11%.
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This. And oh I'm so lazy: I was typing out my answer, trying to get it right, knowing that the best way to explain it would be pics but I couldn't be arsed.

Iirc it's more or less: 3000k: 12% 3500k : 15-16% 4000k : 20% 5000k : 25%

This to the best of my recollection; please anybody correct me
 
Rocket Soul said:
This. And oh I'm so lazy: I was typing out my answer, trying to get it right, knowing that the best way to explain it would be pics but I couldn't be arsed.

Iirc it's more or less: 3000k: 12% 3500k : 15-16% 4000k : 20% 5000k : 25%

This to the best of my recollection; please anybody correct me
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Ok but the area of blue is still several times larger than on HPS is it not??? This is good I figured it wasn't as simple as straight percentage. Still feeling out the spectrum info.
9502A56D-953B-4089-B451-D33C11B2646F.jpeg
 
MidnightSun72 said:
Ok but the area of blue is still several times larger than on HPS is it not??? This is good I figured it wasn't as simple as straight percentage. Still feeling out the spectrum info.
View attachment 4981760
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Please don't quote me, as I can't seem to find the info rn, but I believe I've seen it quoted as 2% for a standard HP's spectrum. This one above seems to have a little more than normal though.
 
grotbags said:
hmmm i wouldnt say it was several times more, but its really hard to judge from the pic, someone would have to plot it out and do the math and that someone isnt me... :bigjoint:
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Ok well I had these measurements from my pulse pro. The HPS spectrum is from a gavita 1000e with the factory bulbs.

blue % =[ 72.5/(72.5+ 531.7 + 478.3) ] x100= 6.7%
A38417A0-63CA-4491-921D-560624FFCED0.png


blue % =[ 170.5/( 170.5+ 519.3 + 428.1)]x100= 15.3%
CC045A85-99C3-44D5-BB02-FDEB4548E91D.png

I feel like that's still close to 2.3X the blue. But I defer to your experience.
 
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MidnightSun72 said:
Ok well I had these measurements from my pulse pro. The HPS spectrum is from a gavita 1000e with the factory bulbs.

blue % =[ 72.5/(72.5+ 531.7 + 478.3) ] x100= 6.7%
View attachment 4981768


blue % =[ 170.5/( 170.5+ 519.3 + 428.1)]x100= 15.3%
View attachment 4981767

I feel like that's still close to 2.3X the blue. But I defer to your experience.
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yer i think to say double the amount isnt far off...

but remember the sensor used by the pulse pro for the spectrum only has a resolution of about 37.5nm (it can only take 8 samples from 400nm to 700nm) so depending on where they fall could it be cutting off or extending the blue boundry line thus fudgeing the results...
also the pulse pro uses a nir sensor to measure i/r from 850nm to 1100nm so the pulse pro will pick up a load of i/r from the sodium which is not present at all in the 2700k led spectrum, again fudgeing the data...
 
Wow ha started a debate love it.

So 2700 and 3500 arnt much different atall? Exept the 3500 has more blue eh.
So using a combo of both im hoping to beavle to stretch but control stretch too in my scrogg. But add that 90cri hype into my mix without loosing yield.
Ive seen alot about the 4k being more thc but less yield. My thcs spot on due to organics . my yields what im working on maximising

Am i best to keep my luminosity of the 3500k80cri x28 then or 2700 3500 mix. Or midnight says 4k 2700mix which i understand i do. But the 4k in flower worries me on the yield side. I feel 3500 atm is what im confortable with max. I need to build some 4k 6k at xmas for tests myself

Ive seen 3000k ripping shit outa the world i just cant get that chip .

2700 and 3500 both avalible in stock though .

And i got drivers for em x4 atm got a bargin
 
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