replacing projector bulb

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It Can Be Done.

Hello marc5193,
In my experience LCD projectors use a proprietry reflector with a standard lamp assembly mounted using a white plaster like cement substance.
With a sharp probe, this plaster material can be chipped out and so releasing the actual lamp.
If you are to take a very close look at the lamp you will likely find a manufacturer part number etched into the glass that you can search on.
I believe Osram make most such lamps, and these discrete lamps are available from lamp wholesalers.
A colleague of mine did a successful replacement by this method, although the lamp terminations were different to the original.
I do not know of a source of the white cement, but lamp wholesalers or electric heating element manufacturers may be a starting point.
NOTE WELL - these lamps are highly pressurised and will EXPLODE if mistreated so a safety mask is MANDATORY.
When replacing large high power stage follow spot lamps, a face mask, leather elbow length gloves and leather chest high apron are STANDARD equipment.
I agree that the price of a replacement lamp/reflector assembly is horrendous - mine is rated to run 1000 hrs and will cost me AUS $400 trade price, so my projector only gets used for movies, and not television = 40 cents per hour - eeeek.
The salesmen and advertisements for modern LCD projectors do not tell you this crucial fact.

Regards, Eric.
so in therory if you bought a metal halide lamp of the same rating and fitted with the white cement itt should work ok ? or are these bulbs specialist ? and i though metal halide bulbs needed a ballast to run, this means that the projector itself must have a ballast built into it then. the metal halide bulb I came across was rated the same as my original and detailed as giving off a crisp white light with a rating of 10.000 hrs lifespan but at only £12 this seems a little cheap for metal halide bulb that lasts much longer than my original bulb at £400 is this a scam by the marketing salesmen and company,s or are these bulbs really that special ? and also would it be possible to buy a metal halide bulb and ballast diy set and somehow fix it into a comercial lcd projector ? I ask these questions because not a lot of info seems to be covered reguarding this topic.

Thanx in advance

Hello fido13uk,
You will need to get a lamp that is the same type as the original, excepting maybe the terminations, and if the terminations are different make suitable modifications to the connections arrangement.
These machines run an electronic SMPS to supply the lamp, so your replacement will need to be of the same ratings as the original.
I would not try to run a different lamp, or different ballast.
Take a very close look at the original to glean any identification numbers and go searching from there.
The main stream domestic electronics manufacturers run incredible markups on spare parts in order to support thier parts distribution network, and to cause redundancy in older equipment, and hence new sales.

Regards, Eric.
thanx 4 the reply mrfeedback, my projector bulb only states it is rated at 150 watt metal halide i dont know the voltage but it is protected with a 2 amp sm fuse built onto the lamp holder, are there certain metal halide lamps or are all metal halide bulbs the same ? all i can search on is the lamp wattage but if one of these cheaper bulbs would work it would be much better than the original as the cheaper bulbs have a 10.000 hour life, i also know that the bulb needs a crisp white light and these cheaper bulbs are capable of that, one thing i noticed on the original bulb was there appeared to be a chalky white powder substance coated on the glass of the bulb dunno if this is due to the amount of heat generated in the bulb though. btw: the lamp is a double ended type


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thanx 4 the help mr feedback do u know who supplys the uk12 and how much they cost ? do u mean the reflective coating on the lamp or the bulb ?
also my projector is rated at only 450 lumens would my projector not work if i modified it with a bulb of a higher lumen rating ? i know this is low by todays standards but i can watch this projector during the day and with lights on and its clear enough, I also like it because it has a whisper quiet fan, sorry to be a pain but i am new to all this stuff.

Uk12 means UKpounds 12.00 - you mentioned that.
I suggest that you take your lamp/reflector assy to a lamp wholesaler and get them to help.
They will likely have catalogues and be able to track down a suitable replacement for you to fit, or go to Osram site and do some searching.
I meant the reflective coating on the reflector.
Also DO NOT TOUCH the envelope of the actual lamp - it is a silica glass material, and any finger oil or other contaminants will weaken the envelope causing it to explode during operation - READ the precautions above.
Use clean tissue whenever handling the lamp.
Happy hunting.

Regards, Eric.
if the lumen rating in the new bulb was much highger than my original ?

Yes the extra heat and light will likely melt/damage any of the elements in the light path - lcd panel, filters, lenses etc.
Like I said, take a REALLY CLOSE LOOK for any type numbers so you can identify the original lamp, or a suitable substitute.
If so tell me the numbers.

Regards, Eric.
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