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The spectrum is the segmentation of the radiation according to their wavelength components.


Starters are componentr for operating a low-pressure lamp with a heated electrode.
Starters have limited life time and must be changed regularly.

Sun-Erythema Factor

The fse is the reference name of the eryhtemal irradiance at 0,3W/m². This value is a typical value at clear sky near the equator at midday.
It is not the highest expected value on earth and it's also reached in areas far away from the equator.
A fse of 100% ist 0.3W/m², 50% is only 0,25W/m².
There are other, similar references e.g. the meteorology UV index.