Changing A Lamp - Clarity Bengal SN-6010-720 User Manual

5.1 Changing a Lamp

You will need a slot head screwdriver for this procedure.
What is meant by median lamp life?
Lamp life is the median life of a large sample of
lamps. Median means middle. It is not what most
people think of as average.
Suppose the specification for lamp life is 5000
hours. If you had a large group of these lamps, more
than 100, and you turned them all on at the same
time, after 5000 hours at least half of them would
still be on.
Suppose 50 of these lamps had failed after only 1
hours of use. Then suppose the rest of the lamps
failed after 5001 hours. The average life of these
lamps would be 2501 hours.
But the median life specification is still valid,
because at least half of them lasted 5000 hours. This
is the way all lamp manufacturers specify lamp life—
as the median, not the average.
Taking a different case, suppose the first 50 lamps
failed at 1 hour and the rest of them lasted 10,000
hours. The specification is still valid, because at least
half of the lamps were still working after 5000 hours.
You can't tell from the lamp life specification how
long any one lamp will live.
The median lamp life for the Bengal lamp is 4000
hours. If you routinely change the lamp at 4000
hours, you may be throwing away thousands of hours
of useful life. And you may be replacing it with a
lamp that is destined to last less than 1000 hours.
There are some actions that can shorten lamp life:
• Turning off AC power when the lamp is on. (Turn
off the lamp with the remote and let it cool until
the fans stop; then turn off AC).
• Turning a lamp on and off rapidly. (The lamp
should be allowed to heat up fully before turning
it off, at least five minutes).
WARNING
There are electrical interlocks behind the left
and right access panels. Removing the
access panels to change the lamp or filter will
cause the lamp to turn off. Defeating the inter-
locks risks exposure to UV.
How to change the lamp.
1. If you are changing the lamp for any other reason
than it is dead, use the remote control to turn off
the lamp and allow it to cool down. Allow the
lamp to cool down for 15 minutes before remov-
ing.
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2. Turn off the AC power switch underneath the sig-
nal input panel on the back-left of the Bengal and
remove the power cord.
3. Remove the right access panel by removing two
6x32 screws at the bottom of the panel and slid-
ing it to the right.
4. Use screwdriver to loosen the captive screw hold-
ing the lamp in place.