I use this one:
VM(?) 1988 Spectral Luminous Efficiency Function for photopic vision > https://www.rit.edu/cos/colorscience/rc_useful_data.php
From which I made this file to extend the curve to 800nm:
Using the datasheets for LM301H (70-80-90 & ONE) and using the following values for the electrical input:
- 2,7V
- 0,065 A
I found, using the average values for lumens output for each color temperature and each CRI the following data:
So I think that the correct efficiency values are around...
I will compute the Radiant Flux, umol/s, LER this evening.
As Photopic Curve min = 360 nm and max = 830 nm these calculations will not be as accurate as I want
My XTE White charts were false ! So with the good values :
XTE 2200K
Power in : 1.00 W (2.85V x 0.35A)
Luminous flux : 123 lumen
Efficacy : 123 lumen/W
LER : 309 lumen/W > 305
Radiometric eff.: 39.8%
Radiant flux : 0.40 W > 0.403 W
Photon flux : 1.99 umol/s (2.00 per Watt) > 2.02 umol/s
Blue...
To find radiant flux (Watt) from lumen, I use this equation:
lumens = 683.002 x Sum ( Vi x Pi x di)
With :
Vi = Photopic CIE 1931
Pi = Relative radiant spectrum
di = delta nanometer
I first normalized the Relative Radiant Power between 300 and 800 nm
I compute the area under this curve for 1...