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How to get the best life of your expensive projector lamp!

The cost of old lamp types has increased dramatically and the last few manufacturers are gradually phasing them out due to low demand and high cost of manufacture.

These lamps have an expected burning life of 15 to 25 hours when correctly used and adjusted.  On this page I will explain how to make the lamp last its expected time and to how to avoid premature lamp failure.

What affects lamp life?

Two types of lamps are used in projectors - a) Tungsten Multi-Coiled Filament lamps (oblong glass lamps with a variety of bases, common to many old slide projectors and some movie projectors; and b) Quarts Iodine Halogen (QI) Single-Coiled filament lamps (small 2-pin bulbs with or without reflector - used in most later model slide and movie projectors).

Now go to this page to see how
to adjust lamps for better lamp life!

How to tell why the lamp burned out!

Unless the lamp exploded you can often tell why it failed, and here are some examples.

Click of lamp images to enlarge!

If the lamAir leak in new lampp only lasts minutes, gets a whitish film inside and all the filaments have blown to pieces, then the lamp has leaked air.
This may be due to a manufacturing defect, a drop or impact in transit.

Such a lamp may be replaced if it is returned promptly within 10 days.

This lamBurned out lamp with bulges indicating poor adjustmentp has a blackened glass and filament bars, and a slight bulge is developing.

This lamp is almost certainly at the end of its normal life.
However, the slight blistering is also an indication that it may not have been positioned correctly in its socket.

When a new lamp is fitted its position should checked and adjusted immediately, and before any use.

See this page for details!

Bulging blown lamp indicating incorrect adjustment of lamp or mirrorThis lamp lasted only a short time. Bulges appeared on both sides and the filament just burned apart. It could easily have exploded.

This is typical of a lamp that either wasn’t adjusted correctly, OR, where the mirror in the projector was displaced (indicated by the different levels of the bulges).

Such a failure is not covered by any warranty and is a good reason to ensure a new lamp is correctly adjusted.

Here’s how …