Optic lens to collimate/focus light from a LED.

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Discussion Overview

The discussion revolves around the feasibility of using a lens to collimate or focus light emitted from an LED, specifically targeting distances greater than 500mm. Participants explore the characteristics of lenses and their effects on light divergence and convergence.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant inquires about the possibility of collimating or focusing light from an LED.
  • Another participant questions whether the focus or collimation is preferred, suggesting a choice between the two.
  • A different participant clarifies that they are looking for a lens that can achieve a divergent/convergent angle smaller than 1 degree, indicating a preference for collimation.
  • It is proposed that a point source at the focal distance of a lens will produce a parallel beam, suggesting a focal length of 10-30mm for the lens.
  • The thin lens equation is mentioned as a relevant consideration for the discussion.

Areas of Agreement / Disagreement

Participants express differing views on whether to focus or collimate the light, and there is no consensus on the optimal approach or lens specifications.

Contextual Notes

The discussion does not resolve the implications of using different focal lengths or the specific requirements for achieving the desired light characteristics.

David_woo
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Hello.

I'm looking for a lens that can collimate (or focus far away >500mm ) a light coming out from a LED.

before I give more details is this even possible?

Thanks.
 

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Science news on Phys.org
Take a pick, do you want it collimated or focused?
 
if the focused focal is far away it doesn't matter, I just looking for divergent/convergent angle smaller to 1 degree.

but if you want a pick let's said collimator.
 
A point source at the focal distance of a lens will produce a parallel beam out. So you want a 10-30mm focal length lens.

You need the thin lens equation.
 

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