Epson Pro L1500UH, User Manual

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Constant Brightness off
1 Brightness level
2 Time before the brightness of the light source is reduced by half (approximate)
Brightness Level setting Hours
100% 20000 hours
90% 21000 hours
80% 24000 hours
70% 30000 hours
60% 37000 hours
50% 47000 hours
40% 61000 hours
30% 71000 hours
Constant Brightness on
1 Brightness level
2 Time the projector can maintain constant brightness (approximate)