![light intensity equation light intensity equation](https://image.slidesharecdn.com/lawsofilluminations-121201133136-phpapp02/95/laws-of-illuminations-8-638.jpg)
This result also leads to a luminous intensity class of G*3. Luminaire luminous flux (c,y): 548 cd/klm / 1.00 = 548 cd/klm (548cd/klm is in the photometry file, 548 cd/klm is also to be used according to EN 13201:2015 for the light intensity class).Lamp luminous flux: 9000 lm * 1 = 9000 lm.However, due to the requirement in EN 13201:2015 to refer this luminous intensity value to luminaire luminous flux, we have to carry out the following calculation: As with relative photometry, this value refers to the 9000 lm lamp luminous flux. From the luminous intensity table, for example, a maximum value (range 70°-80°) of 548 cd/klm can be read.The photometry would therefore no longer be correct!
![light intensity equation light intensity equation](https://i.ytimg.com/vi/c7nocFEqrYM/maxresdefault.jpg)
If we would not carry out the conversion of the luminous intensity values here, the Integral IdOmega over all luminous intensities would no longer give 9000 lm luminaire luminous flux. This result leads to a luminous intensity class of G*3. Luminous intensity value (c,y): 356 cd/klm / 0.65 = 548 cd/klm (356cd/klm is in the photometry file, 548 cd/klm is to be used according to EN 13201:2015 for the light intensity class).However, this value refers to the 13846 lm lamp luminous flux. For example, the luminous intensity table shows a maximum value (range 70°-80°) of 356 cd/klm.However, since EN 13201:2015 requires luminous intensities to be expressed in in relation to luminaire luminous flux, Evo must first convert the luminous intensities from the photometric file: Here, evo displays the luminous intensity table directly in. Unless it is an absolute photometry with a negative indicator. In the output of luminous intensity tables, Evo always displays the luminous intensities listed in the photometric file. In LDT photometry files, however, it is usual to specify luminous intensity values in relative to the luminous flux of the lamp. Modified on: Fri, 11 Jun, 2021 at 11:32 AMįor the calculation of luminous intensity classes in accordance with EN 13201:2015, the luminous intensities in relative to luminaire luminous flux shall be used. Solution home Calculation Calculation method Calculation of luminous intensity classes G* according to EN 13201:2015