[AG-TECH] Single computer node and good projectors

Richard Naylor richard.naylor at citylink.co.nz
Thu Dec 11 21:25:07 CST 2003

At 12:35 p.m. 11/12/2003 -0500, Gurcharan S. Khanna wrote:
>our mitsubishis have a "low lamp" mode, but it only reduces the
>lumens from 2300 to 2100, not sure what increase in lamp life
>that translates to.

In an earlier part of life I used to service some large projectors that 
used film for advertising in malls, airports etc. Philips only made the 
bulbs twice a year, and they were expesnive - about $50 each in 1983. They 
lasted a week.

So I dropped the voltage from 230 to 210 and the bulbs lasted a month (I 
swapped them every month when I changed the film - they actually last 6 
weeks. If you want your bulbs to last, drop teh voltage by 5%. easiest way 
is to use a 230/24V transformer and wire the secondary to reduce the 230 by 
24V. (sort of like an autotransformer in reverse). Power utilities do it 
all the time at transmission voltages.

So if your bulbs aren't lasting - make a small transformer unit.


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