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If you just want a highly focussed light source, consider a halogen car headlight bulb. The bulb itself contains a parabolic reflector to give a focussed beam. The Fresnel lens in the front of the actual headlight acts as a diffuser, rather than to focus the beam. I have used a benchtop-sized test rig where a couple of those bulbs (12V 55W each) can heat ...

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