Epson 100" EpiqVision Ultra LS500 4000-Lumen Pixel-Shift 4K UHD 3LCD Laser Projector TV System with 100" Screen (White Projector) - Manual (Page 129)

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Note: If the Illumination setting is Off , all indicator lights are off under normal projection conditions.
1 On/Standby light
2 Status light
3 Laser light
4 Temp (temperature) light
On/Standby
light Status light Laser light Temp light Status and solution
Blue Blue Off Off Normal operation.
Blue Flashing Off Off Warming up. Wait for an image to
appear.
Shutting down. (When the Status light
stops flashing, you can unplug the
projector.)
Blue/Off Off Off Off Standby mode or monitoring.
Flashing Off Off Off Preparing for monitoring or quick
startup mode; all features are
disabled.