Brightness
A standard for measuring light output, used for comparing projectors. Unfortunately, there are enough variables, that the eye will often disagree radically with the ANSI rating. If however one projector uses halogen lamps and another metal-halide, the halogen projector will seem noticeably dimmer even if the two units rate the same. Other variables, including type of LCD technology (TFT LCD, Polysilicon LCD), type of overall technology (LCD vs.DLP vs. CRT), contrast ratios, etc. all effect the end result.
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