Sphere drawing

Radiant Power

Radiant power is the amount of power [light] emitted from a source irrelevant of the direction it is emitted, expressed in Watt [W]. Applied to light sources, it is known as spectral power and defines the total amount of power in Watts emitted for each wavelength in each direction. Admesy offers complete solutions with integrating spheres to carry out spectral power measurements for various types of light sources from UV, VIS to UV-NIR.

A typical radiant power measurement setup consists of a spectrophoto- or spectroradiometer connected to an integrating sphere. This combination allows precise determination of spectral power distribution, dominant and peak wavelengths, CRI, CCT, PAR and color. Admesy’s combined spectro- and colorimeter, the Cronus, additionally allows flicker measurements without the need for a separate device. For more information about radiant power measurements of LEDs, please take a look at our corresponding application guide.

Neo Hera
Spectral analysis yes yes
Dominant & Peak wavelength yes yes
Radiance & Irradiance yes yes
Luminance & Illuminance yes yes
Radiant intensity yes yes
Luminous intensity yes yes
Radiant power Combined with sphere Combined with sphere
Luminous power Combined with sphere Combined with sphere
Low luminance yes

How are you measuring?


With fibers and other accessories even more type of measurements are possible. Often used accessories are integrating spheres, cuvettes for fluids, light sources or filter holders.

Consumers are used to enjoy top-quality displays in their mobile phones, tablets, laptops and even cars. Emerging technologies such as lighting surfaces for office and home illumination are expected to look equally perfect. Both displays and luminous surfaces are the main application areas for imaging colorimeters.