Dell S300wi User Manual page 119

approximately 50 percent of the rated lumens for the specified lamp. The lamp
life rating is not guaranteed in any way. The actual operating life span of a
projector lamp 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 lamp's shortened operating life span or
possible lamp failure.
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Specifications