Lighting Components Withstand High Loads
Home projectors now use extremely powerful projection arc lamps that can generate light outputs of well over 1,000 ANSI lumens and are bound to become extremely hot. The quartz bulb of the lamp reaches temperatures of up to 1,100 degrees Celsius, and reflectors can be subjected to 600 degrees Celsius. Regular glass reflectors, like those used in conventional lighting systems, are unsuitable. Temperature differences of 350 to 400 degrees Celsius, which occur when switching lamps on and off, are especially hard on glass reflectors. These differences in temperature subject the glass to mechanical stresses and strains of up to 40 Mpa. Due to thermal expansion, hairline cracks in conventional glass reflectors would then expand and cause breakage. That is why reflectors made of heat-resistant borosilicate glass are used with lamps having a power consumption of up to 200 watts, where even higher temperature differences can occur.
Reflectors Made from Glass Ceramics
Coating Provides Thermal Compensation