Besides when the lamp operates at very high temperatures, the surface temperature of the lamp casing about 250 C, in conditions many chemicals (inert gas, Halogen compounds) lead to create large pressure (5 bar) so the light casing built using Quartz to withstand the high temperatures and pressure.Quartz crystal structure aligned so well for light passing through glass better usually.Halogen lamps have average performance, about 10% of the electricity capacity turns into optical power (25 lm/W), the lifespan of about 2500 → 4000 h, color temperature 3200K, response time 1 s.
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