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From: N_Cook on 26 Jul 2010 04:28
The inkjet printer syndrome. Why pay for a new set of inks when a whole new
printer costs only a little more than that. Another thrown out video
projector, all that clever technology , just because a replacement bulb is
near enough the cost of a whole new projector. Anyone know of a supply of
generic basic discharge lamps, intended for fanned operation?
This one, from the manual, was 210 watt NSH lamp, NSH = ??? = something
metalic nickel? (N ?) Sodium Halide ?
I have a few 150W "Power Star" discharge lamps that will physically just
about fit in the available space. Used in floodlights they don't need fans,
projector versions , as fan cooled , are physically smaller.
In a luminaire these 150W lamps take 0.55 to 0.6 amp at 240 V mains , in
use. Tried one on the projector with a 12V 50W filament halogen lamp in
series as a bit of a dropper.
With ammeter in mains supply , overall current (including SMPS and fans etc)
was 0.8 amp for 10 seconds or so and then jumped to 1.2 amp to full
brightness. I chickened out then and switched off. Where to go next ? Next
time I will dig out an old analogue ammeter (concerned about the presumed 4
or 5 KV starter/igniter) and place in series with the lamps.
No mention in the manual of this initial power step but it is the same with
my other projector so presumably generically normal. 6 wires connect to the
ballast/choke so presumably there is active switching of parts of the choke
which maybe selectively disableable and not monitored by the controller. I
can live with reduced light output, my other one has a preset option and is
set for half power maximum on normal user brightness control.
Any other ideas ?


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