Sources of light
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9 Terms
Incandescent:
Light produced from heat (hot tungsten filament glows)
Fluorescent:
Electricity excites gas → produces UV light → phosphor coating turns it into visible light
Phosphorescence:
Absorbs energy and releases it slowly over time (glow‑in‑the‑dark)
Chemiluminescence:
Light produced from a chemical reaction (no heat)
Bioluminescence:
Chemiluminescence in living organisms (fireflies, jellyfish)
Triboluminescence:
Light produced when materials are crushed, scratched, or rubbed
Electric Discharge:
Electric current through gas → glowing gas ( Neon signs, lightning
LED (Light‑Emitting Diode):
Very efficient electroluminescence using semiconductors
Neon / Gas‑discharge lights:
Electricity excites gas atoms, releasing coloured light
Note 
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