Optimal spacing of diffusive sheet between light and destination

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SUMMARY

The optimal positioning of a sanded PMMA diffusive sheet between two parallel planes, A and B, measuring 250x300 mm and separated by 200 mm, is crucial for achieving maximum light scatter. Placing the diffusive sheet too close to the light source (Plane A) results in visible separation of the fluorescent tubes, indicating insufficient scattering. Conversely, positioning the sheet against Plane B minimizes scatter. The ideal placement is slightly away from Plane A to balance light diffusion and minimize the box size while maintaining effective scatter.

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  • Understanding of light diffusion principles
  • Familiarity with PMMA material properties
  • Knowledge of fluorescent lighting characteristics
  • Basic concepts of optical design
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This discussion is beneficial for optical engineers, lighting designers, and anyone involved in the design of compact lighting systems seeking to optimize light diffusion and scattering techniques.

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Hi,

I have 4 fluorescent tubes in plane A as a light source. Plane B is receives the light and is parallel to plane A. In between I'll put a sanded piece of PMMA in order to scatter the light. Each plane is approximately 250*300 mm. For a fixed distance between A and B, let's say 200 mm, what would be the optimum position of the sanded PMMA in order to achieve maximum light scatter at B? This is all in a closed box of 250*300*200 mm.

If you put the diffusive sheet very close to the light you can clearly make out the separate tubes which might mean that maximum scatter is not achieved. On the other hand if you place the diffusive sheet against plane B there will hardly be any scatter at all.

Would you say that placing the sheet as close as possible to A is optimal or is the optimum somewhat away from A?

The goal would be to reduce the distance between A and B as much as possible to get a small box while still achieving sufficient scatter.

Thanks in advance for any thoughts you have on this.
 
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