Dell Mobile Projector M900HD - Manual (Page 77)

Wireless Wireless Standard: IEEE 802.11a/b/g/n (2T2R)
OS environment: Windows 8/7/Vista/XP/2000,
MAC OS X
Supports MobiShow and WiFi-Doc projection.
Light Source Mercury-free LED (up to 20000 hours in Normal
mode)
NOTE: The LED life rating for any projector is a measure of
brightness degradation only, and is not a specification for the time it
takes a LED to fail and cease light output. LED life is defined as the
time it takes for more than 50 percent of a LED sample population
to have brightness decrease by approximately 50 percent of the
rated lumens for the specified LED. The LED life rating is not
guaranteed in any way. The actual operating life span of a projector
LED will vary according to operating conditions and usage patterns.
Usage of a projector in stressful conditions which may include dusty
environments, under high temperatures, many hours per day, and
abrupt powering-off will most likely result in a LED’s shortened
operating life span or possible LED failure.
Specifications 77