If your dichroic reflector lamp, such as the EFP 12volt 100watt (known in the UK as A1/231) fails to work, don't throw it away immediately. Check the pins.
Over time, the small pins suffer from oxidation, this can be recognised by the pins being steely grey (or even black) in colour, this prevents the current of over 8 amps from flowing.
The answer is to clean off the pins and bring them back to their original shiny state. I gently scrape the pins with a scalpel or small hobby knife. I am told that your wife's emery nail board will also do the trick.
But from the start, it may be obvious why the lamp doesn't light such as the filament broken and loose within its envelope.
If you have a test meter with an ohm range you can check the continuity before you take the trouble to re-install the lamp.
_________________ Maurice
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