Measurement of luminous (cd) and radiant (W/sr) intensity can be made with illuminance (irradiance) detectors since luminous (radiant) intensity is related to illuminance (irradiance) by the inverse square law (I = E · d²), assuming a point source configuration.

LED average Luminous & Radiant Intensity can be measured with our PD-9304 (Si Photodiode) equipped with a PD-9311 (0.01 sr solid angle front tube - CIE 127 Condition B) or a  PD-9312 (0.001 sr solid angle font tube - CIE 127 Condition A) and either the PD-9302-VL photopic or PD-9302-RW radiometric filter.

Luminous & Radiant Intensity (LED) Detectors
Model no.	Spectral Function (nm)		TC	FOV (sr)	Units	Dims. (mm)
						Dia.	H
PD-93xx	V(l)	CIE 127 cond. B		0.01	cd	37	144
PD-93xx	V(l)	CIE 127 cond. A		0.001	cd	37	360
PD-93xx	400-1000	VIS-NIR		0.01	W/sr	37	144
PD-93xx	400-1000	VIS-NIR		0.001	W/sr	37	360
PD-93Z-03	Custom Front Cap made in black PVC with 1.3/16-24 UNS thread
TC=Temperature Controlled