Light force spotlights used a standard 2 pin bulb however the is a difference in the filaments compared to one the same shape in the shops you can purchase.
I believe the the common shop bulbs are a vertical filament (running the length of the blub) and light force use a horizontal filament.
This is all for the shape and light spread of the beam.
I am sure you could find an LED replacement but will not have quite the same beam pattern coming off the reflector.
I suggest that you retire the light force and as others have said and proven get and nice new LED mounted torch for the rifle...
If you are nostalgic and want to keep the spotlight going, let me know.. I may have a couple of bulbs you could have that will fit the light force... just let me know what model you have and also what wattage you currently using.... I have a bunch lying around somewhere.
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