×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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 sources

thread239-100752

light sources

light sources

(OP)
does anyone know of a cheap efficient (ideally greater than 80%) light source? I'm after one for UVa 315-450nm and one for green light at 520nm +-20nm. The ones I have looked at so far are neither cheap nor efficient. I need a fairly intense source preferable (in the order of watts rather than milliwatts)....
Replies continue below

Recommended for you

RE: light sources

please define "cheap"

TTFN

RE: light sources

Is 80% a reasonable efficiency for a light source, any light source? I thought solid state devices were quite efficient but I haven’t seen any figures on it. Fluorescent tubes are very efficient compared to incandescents, but again I would have thought the actual production of light efficiency was horribly poor. I would be interested in seeing actual figures for light watts per electrical watt.

RE: light sources

EL panels are probably the most efficient lights around, but they're available in a limited set of colors.

As for the original poster, he needs a laser diode, but they're not cheap and not necessarily that efficient

TTFN

RE: light sources

(OP)
by cheap I'm looking in the order of hundreds of pounds/dollars rather than thousands. The efficiency of most solid state lasers is in the order of 0.01%, I'd like to waste less energy than that...

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


News
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