In need of a par multiplier for QB setup

Zackk

Zackk

Member
Hey, everyone.

So I bought a lux meter. I understand these were no good for LED back in the blurple days, but now I'm working with 4x Atreum 288.2s using LM301Bs and the Spectrum King 140W to power a 4x4 space. I'm trying to figure out par using my lux meter but I can't seem to calculate everything properly.

Does anyone have any tips or suggestions?
 
wietefras

wietefras

Well-Known Member
The LM301B actually has more blue in the spectrum than the LM561C. So, the conversion factor is 71 for the 3000K 80 CRI LM301B and 69 for LM561C.

No idea what's in the Spectrum King. Do they specify what color temperature it is? Also 3000K perhaps? If so it won;t be much different from other 3000K 80CRI leds

Are you sure it's even worth using that SK light? The SK lights do tend to come out with quite low efficacy numbers when tested by a lab. IIRC it's something like 1.35umol/s/W or similr to HPS and about half of what you get with recent leds.
 
D

Dave455

Well-Known Member
wietefras said:
The LM301B actually has more blue in the spectrum than the LM561C. So, the conversion factor is 71 for the 3000K 80 CRI LM301B and 69 for LM561C.

No idea what's in the Spectrum King. Do they specify what color temperature it is? Also 3000K perhaps? If so it won;t be much different from other 3000K 80CRI leds

Are you sure it's even worth using that SK light? The SK lights do tend to come out with quite low efficacy numbers when tested by a lab. IIRC it's something like 1.35umol/s/W or similr to HPS and about half of what you get with recent leds.
Click to expand...
How about cree cxb3590 3000k 80cri ?
 
Zackk

Zackk

Member
wietefras said:
The LM301B actually has more blue in the spectrum than the LM561C. So, the conversion factor is 71 for the 3000K 80 CRI LM301B and 69 for LM561C.

No idea what's in the Spectrum King. Do they specify what color temperature it is? Also 3000K perhaps? If so it won;t be much different from other 3000K 80CRI leds

Are you sure it's even worth using that SK light? The SK lights do tend to come out with quite low efficacy numbers when tested by a lab. IIRC it's something like 1.35umol/s/W or similr to HPS and about half of what you get with recent leds.
Click to expand...
I could change it out for something different. Maybe i'll try to sell it off and install some strips instead. I'd just also have to buy a new driver. Probably worth the investment though.
 
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