Connect with us

Video projector lamps

Discussion in 'Electronic Repair' started by N_Cook, Jul 26, 2010.

Scroll to continue with content
  1. N_Cook

    N_Cook Guest

    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 ?
  2. shrtrnd


    Jan 15, 2010
    This is not going to be any help for your problem.
    The 'NSH' is just the identifier for that bulb, it's not at acronym.
    The projectors are designed around the bulb, and I don't know a substitute for NSH.
    When I buy something, I find-out if the expected replacement parts are available, and their cost, ...and figure that into the initial purchase selection.
    If you start tinkering with the circuit, to try to use a different bulb, you are taking a chance of setting your projector on fire.
    A quick check on the web shows that bulb selling anywhere from $262 (U.S.) to $385.
    If you keep hunting on the web, you may find one cheaper.
    Sorry I couldn't be more helpful. But I've seen people set their gear on fire trying to substitute parts, and wanted to give you warning.
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day