F21KLevel 3
NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE
**Definition:** This place covers:
The following light sources per se:
**Glossary:** - Light source: The entity (e.g. light bulb, gas mantle, combustible charge) that generates light for a lighting device or apparatus. The light source of the lighting devices or lighting apparatus may be electrically powered (e.g. power is supplied by electric batteries, electric cells, electric generators, flexible cables for electric mains constructions), non-electrically powered (e.g. power is created by combustible fuels, triboluminescence) or a naturally occurring source of light (e.g. sunlight).
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