Yes, they are vastly different. A projection lamp is actually a precision instrument, made to very stringent quality standards. It%26#39;s filament must be exactly in proper mechanical and optical relationship to the optics of the projector, so it is precision-made and aligned during manufacture. The lamp%26#39;s color temperature is also held to rigid standards, and cannot deviate(much) during rated lamp life. The outer envelope, or bulb, of a projection lamp must be made of special glass, or often quartz, in order to withstand the extremely high temperatures of operation. No household "light bulb" could possibly do the job of a projector lamp.
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