Adrian Jansen wrote in message
eb.com...

On 25/9/2012 5:53 PM, N_Cook wrote:
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



More specs at http://www.ledengin.com/products/emitters/#LZ9

But 1300 lumens is still a long way from a typical video projector. eg
the NEC NP64 is supposed to put 3000 lumens on the screen, that includes
all the optical losses along the way.


--
Regards,

Adrian Jansen adrianjansen at internode dot on dot net
Note reply address is invalid, convert address above to machine form.



I still cannot find the half-power beam angle. It 15 degrees fine but if 120
degrees then back to all the optics losses business