Cheap and Cheerful DIY using Citizen cobs

BOBBY_G

BOBBY_G

Well-Known Member
why the hype over cri/color when it seems that everything from 2700-3500k tops out at +/- 2.6 on photon flux?
 
BOBBY_G

BOBBY_G

Well-Known Member
well based on your numbers, all of 2700-4000K in both 80 and 90 CRI are between 2.51 and 2.66 umol/W

if photons are king, that implies minimal difference between any of these colors in real-world application.

i know thats an over simplification or wed all be using only royal blues but i figured i would open the discussion
 
JorgeGonzales

JorgeGonzales

Well-Known Member
BOBBY_G said:
well based on your numbers, all of 2700-4000K in both 80 and 90 CRI are between 2.51 and 2.66 umol/W

if photons are king, that implies minimal difference between any of these colors in real-world application.

i know thats an over simplification or wed all be using only royal blues but i figured i would open the discussion
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That's about right, yeah. The thing is lumens/W goes down, so that looks bad, and so does PPF because of the push of a few percent of the output above 700nm. But the number of photons doesn't seem to change a whole lot, no.
 
Sativied

Sativied

Well-Known Member
BOBBY_G said:
why the hype over cri/color when it seems that everything from 2700-3500k tops out at +/- 2.6 on photon flux?
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The ongoing realization you don't have to sacrifice many years of using an optimal spectrum and efficiency at the target for efficiency at the source isn't hype lol... As hard as that must be to swallow for all the idiots who threw trantrums when I pointed out the 3500K is not the optimal nor the obvious choice but selected and hyped by selfproclaimed led experts misreading data sheets.

BOBBY_G said:
I know thats an over simplification or wed all be using only royal blues but i figured i would open the discussion.
Click to expand...
Sounds familiar... What you already could have established based on that is that ppf is thus not king in a black and white world. As obvious as it is to you that one shouldn't use blue only, as obvious it is to many others the warmer and/or higher cri whites are less less-suitable for horticulture. Despite petty egos obfuscating matters and slowing progress, it will become as common sense as not using only blue.
 
JorgeGonzales

JorgeGonzales

Well-Known Member
weed-whacker said:
nice

looks like the CLU 58 @100w is getting about the same PF/W as the CLU48 @50w
meaning that unless the CLU48 is half the price it costs more
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Generally they do cost about half the price. The whole lineup scales pretty smoothly, so no games to play there. Like an 1812 is about half the price of an 1825, for about half the dies.
 
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weed-whacker

weed-whacker

Well-Known Member
BOBBY_G said:
which 048 and 058 are you talking about?
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they all are getting about 2.2-2.3 pf/w vs the 58 getting the same at around 100

i wasn't comparing any one in particular just noticed that

the CXB3590 at 50w is around the same as the 48 right? 2.2/2.3?
 
pop22

pop22

Well-Known Member
a $60 heatpipe based heatsink MIGHT work..... a standard pc heatsink I doubt it will handle 250 I think Intel maxed out at 150 watts a few years ago. Standard pc heaqtsinks are good for up to maybe 100 watts if you don't mind running on the hot side.

here's data on a Arctic Alpine 11, one that seems popular with led builders. Tested @ 150 watts:

With a 150W heat load applied by the Intel LGA775 version of FrostyTech's synthetic thermal test platform, the Arctic Cooling Alpine 11 Pro heatsink is able to maintain a satisfactory temperature of 40°C over ambient, with 46.1dBA noise. The Alpine 11 Pro heatsink was then tested with a reduced fan speed of 500RPM, where it maintained an unsatisfactory temperature of 74.4°C over ambient. Clearly, the heatsink fails to keep up on the 150W test when fan speed is reduced to 500RPM.

Ryante55 said:
I have a couple of those heatsinks I dont think I would buy one again I'll do a little more research I'm thinking a CPU cooler might be a good cheap option if it could cool 250w
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V

voon

Well-Known Member
https://uk.hardware.info/reviews/5629/5/39-cpu-coolers-review-what-is-the-best-choice-graphs-cooling-socketn2011
Very good choice be could buy
SilverStone ArgonAR01 .. It is very nice ratio price,cooling..silence is little worse,but also still good..
pop22 said:
a $60 heatpipe based heatsink MIGHT work..... a standard pc heatsink I doubt it will handle 250 I think Intel maxed out at 150 watts a few years ago. Standard pc heaqtsinks are good for up to maybe 100 watts if you don't mind running on the hot side.

here's data on a Arctic Alpine 11, one that seems popular with led builders. Tested @ 150 watts:

With a 150W heat load applied by the Intel LGA775 version of FrostyTech's synthetic thermal test platform, the Arctic Cooling Alpine 11 Pro heatsink is able to maintain a satisfactory temperature of 40°C over ambient, with 46.1dBA noise. The Alpine 11 Pro heatsink was then tested with a reduced fan speed of 500RPM, where it maintained an unsatisfactory temperature of 74.4°C over ambient. Clearly, the heatsink fails to keep up on the 150W test when fan speed is reduced to 500RPM.
Click to expand...
 
pop22

pop22

Well-Known Member
considering the prices, the pin type LED heatsinks seem to me to be the best option when comparing price/performance. Although, like some top end pc heatsinks, I'd like to see a pin type with a silver coated, copper plate, bonded to it.
 
Vonkins

Vonkins

Well-Known Member
Ok guys bout to build my new light. Here's my basic list of what I will need. Please correct and give opinions.
16 ×CLU-048-1212 3500k 90cri
4×HLG-185h-1400b drivers
4×Heatsinks 5.88"×36"
2×200k ohm dimmer
16×Ideal cob holders
Do I need thermal pads and relfectors?
If there's anything better that I need please let me know. Like I said all opinions are definitely wanted.
 
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