How to Tell If an InFocus 4805 Projector Bulb Is Bad

InFocus' SP4805 home entertainment projector features a simple keypad with programmable remote control buttons, and an icon-based menu allows for quick settings adjustments. The projector can connect to DVD players, game consoles, computers and more. A dual mode 160-watt or 200-watt bulb should provide either 3000 hours or 2000 hours of use. You can tell if the bulb is bad by following some steps.

• 1

  Watch the screen at startup. Twenty hours before the lamp is expected to expire, a warning message will appear on the screen reading "Change Lamp." A red LED will also flash. The lamp is a high-pressure, mercury glass lamp that can rupture with age, so the manufacturer is keen to get you to replace the lamp before it potentially breaks and spills its hazardous material.

• 2

  Look for unusual dimming of the picture. Unusual dimming indicates a failing bulb.

• 3

  Look for rupturing of the bulb. Any broken glass indicates a bad bulb.