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Figure 9.5 –Incandescent lamp
Incandescent lamps are usually used for local illumination and for areas where
personnel stay temporarily.
Gas-discharge lamps emanate optical range light resulting from an electric
discharge in rare gas and the metal steam environment as well as luminescence.
Advantages:
- economy, light efficiency 40–100 lm/W;
- operation life up to 10 thousand hours;
- any spectrum guarantee;
- reheat temperature – 30–60 °C.
Drawbacks:
- light flux pulsation that can cause stroboscopic effect and the optical effect
of moving objects;
- complicated switching system;
- relatively expensive;
- a significant period between switching on and striking.
Gas-discharge lamps can be of high (fluorescent) or low pressure (figure 9.6).
Figure 9.6 – High-intensity discharge lamp
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