Weathering test instrument and solid-state light-emitting device system

A solid-state light-emitting device system, comprising:

• a light source section including a plurality of solid-state light-emitting elements, the solid-state light-emitting elements being different in kind from one another, and being configured to emit light beams having respective wavelength regions that are different from one another;
• a light receptor configured to receive the light beams radiated from the light source section individually for the respective wavelength regions;
• and
• a controller configured to control radiant intensities of the respective solid-state light-emitting elements individually, based on received light amounts for the respective wavelength regions derived from the light receptor, and thereby control irradiance at a sample surface for each of the wavelength regions to allow an accelerated test of a sample to be performed,
• wherein the solid-state light-emitting device system is applied to a weathering test instrument.