Halogen lamps The (Freshwater aquarium fish) tungsten filament of incandescent
Halogen lamps The tungsten filament of incandescent bulbs is here replaced by another metal, which prevents them from turning black. These lamps can be equipped with a rheostat, but they are generally little used by hobbyists. Discharge lamps An electrical discharge between two electrodes vaporizes a gas, such as mercury or sodium vapor - which emits an intense light. These lamps have a slight yellow dominant, imperceptible to the human eye, which is compensated by a blue fluorescent tube. They heat up and consume more electricity than fluorescent tubes. Some, known as HQI daylight, are prized by aquarists, but they are expensive and impractical for normal tanks. They are mainly used in seawater aquariums over 0.5 m in height, as they help to acclimatize Anthozoans with Zooxanthellae (see page 169).
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