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Old 03-18-2008, 07:20 PM #1
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Default Light beam for burning?

i was thinking last night.... if you got 100W halogen bulb and focused all the light into a small point using mirrors and lenses could you burn with that?

Kind of like this


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Old 03-18-2008, 07:45 PM #2
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Default Re: Light beam for burning?

Yes you can, in fact Archimedes is famed to have done something exactly like this.
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Old 03-18-2008, 08:45 PM #3
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Default Re: Light beam for burning?

Yeah, I saw that on MythBusters.
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Old 03-18-2008, 09:46 PM #4
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Default Re: Light beam for burning?

You can focus it all to a very small spot but you cant have a beam like that, since the light is not coherent it will diverge very badly.


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Old 03-18-2008, 10:53 PM #5
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Default Re: Light beam for burning?

There is going to be a tiny black spot in the middle of that beam because the lightbulb itself will make a shadow.
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Old 03-18-2008, 11:54 PM #6
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Default Re: Light beam for burning?

It's obviously possible, as this is how the Wickedlasers Torch works. It has a very, very powerful 4100 Lumen bulb with an adjustable focus.
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Old 03-19-2008, 04:21 AM #7
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Default Re: Light beam for burning?

yes u can, but indeed there would be no "beam" as it would diverge from the dot when focused to another place, as if it would be a full cone
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