"N_Cook" wrote in message
...
Like the ink-jet printer nonsense. Loads of nominally working video
projectors around where the lamp has worn out after its 1000 to 2000 hours
and a complete new projector is a little more than the cost of a
replacement
discharge lamp .
Anyone done a conversion to high power LED emitter lamp? tips/pitfalls ?
Obviously a number of opto-coupler functions need fudging as well as
disconnecting the original lamp supply and HV ignitor sub-circuit
lamp supply input side optos , ignitor-on , lamp on, half/full brightness
output side optos , ignitor cct ok, lamp on (drawing correct current)
confirmation
Perhaps should only consider projectors that allow colour temperature
setting within the menu structures
any other considerations?
I just saw reference to this LED lamp cluster , anyone sen the spec of the
beam angle for it
http://www.ledengin.com/news-events/2012-08

Don't even bother. It is totally impossible to retrofit an off the shelf LED
'light engine' into the existing projector optics. You *will* be wasting
your time. The original short-arc, ultra-high pressure mercury or metal
halide lamps will have lumen outputs typically 20-30x the best you could
achieve with an LED 'cluster'. Even if you got the lumens from the LEDs, the
optical source 'dimensions' would be far too massive for the existing lens
system to focus on. The thermal issues would be 'interesting' too as you
would be looking at at least 200W of LED to achieve anything like the
original screen brightness, even with an optical system matched to the
larger LED source.

JB