Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Light transmission thru various plastic

Light transmission thru various plastic

Light transmission thru various plastic

I need to construct a lamp using some sort of plastic about an inch thick to transfer light from one edge to the other.  I need to know which material transmits the most light (least lumin loss) from a source  - or which material has the least "resistance", so to speak.  I need to put a light bulb near the edge of some sort of plastic, I was thinking either a piece of polyester resin,  a urathane, or a polymethyl methacrylate (perspex), and I what I'm asking is which one (or one I haven't mentioned out of ignorance) will deliver the largest percentage of the source light out the opposite edge.  

RE: Light transmission thru various plastic

Poly Methyl Methacrylate, is by far the best of the above list re light transmission.
Ally resins, sometimes branded CR39 is also used extensivly in lenses


RE: Light transmission thru various plastic

To have a correct transmision of light you should not forget to treat your plastic part as an optical fibre.
The principle of transmision is that light should "bounce inside of the plastic.
Optical fibres have to 2 layers of different densities to achieve refraction, your second layer will be air.
So the outside of your plastic should be A1 finish to force this condition.
The way the light goes "in" is also important, this is the angle of the light source to the part. I have usually seen this done with a "slant" edge of the part, also polished very well.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Solutions Brief - Protecting and Rescuing On-Ground Personnel
Keeping our warfighters safe and delivering them a competitive advantage is a key goal of departments of defense around the world. It’s a goal shared by embedded computing manufacturers like Abaco: we never forget who we serve.This case study describes how a major international contractor integrated an Abaco single board computer at the heart of its CAS/CSAR solution. Download Now
Datasheet - Top Enhancements Creo 7.0
PTC's Creo 7.0 has breakthrough innovations in the areas of generative design, real-time simulation, multibody design, additive manufacturing, and more! With Creo 7.0, you will be able to design the most innovative products faster than ever before, keeping you on the cutting edge of product design and ahead of your competition. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close