Lighting Easy PAR calculator

[pop22]

No multiply this by lux or lumens per watt estimate to get umols / umol/j. Simply use the listed multiplier for your brand of chip.


Cree COB 3000K 80 CRI 0.014471
Cree COB 3500K 80 CRI 0.014240
Citizen COB 3000K 80 CRI 0.014415
Citizen COB 3000K 90 CRI 0.016079
Samsung 561C 3000K 80 CRI 0.014505


Example 3500K Cree if estimated to get 10000 lumens you would multiply 10000X.014240 and you would have a PPFD of 142 umol/m2sec

Or if for example 3500K Cree the estimate is 140 lm/ watt 140X.014240 or 1.9936 umol/j

 

[KonopCh]

If you have 3000K 80 CRI COBs you can just divide lumens with 69.
Example: 40.000 lumens / 69 = 580 umols

It's the best approximate and waaay cheaper than 150€ PAR meter.

+/- 100 umols, who cares...

 

[wwwillie]

Thanks Pop!!

 

[rayuki]

do you know the multiplier for these chips? https://www.digikey.com.au/product-detail/en/bridgelux/BXEB-L1120Z-40E4000-C-A3/976-1504-ND/6236290

 

[pop22]

I obtained this calculator elsewhere, I did not create it.

However, I'd say the Cree 3500K numbers would get you pretty close.

 

[L0wbob2017]

No multiply this by lux or lumens per watt estimate to get umols / umol/j. Simply use the listed multiplier for your brand of chip.


Cree COB 3000K 80 CRI 0.014471
Cree COB 3500K 80 CRI 0.014240
Citizen COB 3000K 80 CRI 0.014415
Citizen COB 3000K 90 CRI 0.016079
Samsung 561C 3000K 80 CRI 0.014505


Example 3500K Cree if estimated to get 10000 lumens you would multiply 10000X.014240 and you would have a PPFD of 142 umol/m2sec

Or if for example 3500K Cree the estimate is 140 lm/ watt 140X.014240 or 1.9936 umol/j

where did u find these multipliers?

edit: nevermind found the threads on riu