Incandescent lamps have many advantages: simple, low cost, easy adjustment and control of brightness, good color rendering (Ra=100), etc., but at the same time there are many fatal shortcomings: short service life and low luminous efficiency (generally Only 6% (10% of Philips can be converted into light energy, while the rest are lost in the form of heat) and the color temperature is low (2700-3100K). Halogen bulbs greatly improve these disadvantages while preserving the above advantages.
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