Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Cool Lights

  1. Apr 23, 2003 #1
    Hello, I am asking about "cool lights" for a project I have boiling over on the back burner.:smile:

    I have heard about "cool lights" in the film industry. They are supposedly very cool... not hot. Even 50K lights used at night, to make it look like daylight, can be cool lights. The conventional ones are very hot. (Actually, the grips and lighting technicians prefer the hot lights simply because they have become used to handling them cautiously to avoid being burnt... out of habit)

    But, what I am after is a very strong (50K to 200K) light that remains cool. I wonder if anyone has a link or an article pertaining to such a light or "cool light". Thank you.
     
  2. jcsd
  3. Apr 24, 2003 #2
    Last edited: Apr 24, 2003
  4. Apr 30, 2003 #3
    Is what I'm on about related to Cool Lazers?
     
  5. May 1, 2003 #4

    LURCH

    User Avatar
    Science Advisor

    Don't know about the laser thing, but I seem to remember a big bruhaha (if you'll excuse the technical term) about a Chinese resaerch & developement scientist who cracked the problem of making a blue Light Emmiting Diode. With this final part of the colour spectrum opened up, it was said that it should now be possible to produce an LED that produces full-spectrum "white" light. That was some years ago, I would think that such devices would be on the market by now.

    I'll see if I can find any.
     
  6. May 1, 2003 #5

    GENIERE

    User Avatar
    Science Advisor

    There are super bright blue LEDS with a fluorescent coating that emit "white" light but it is not a full spectrum in the visable range (any range). LED 's emitting white light would have to be constructed of material having a wide range of electron energies available, probably organic. I don't see how a full spectrum output would be achieved with any material without severely disturbing Herr Planck's sleep.

    Just getting to the point of having LED's emitting blue light is a pretty good feat.

    Regards
     
  7. May 2, 2003 #6

    LURCH

    User Avatar
    Science Advisor

    Shouldn't a red, a yellow, and a blue LED emmiting through the same lense produce white light?
     
    Last edited: May 2, 2003
  8. May 2, 2003 #7

    LURCH

    User Avatar
    Science Advisor

    Don't know if this helps, but...

    Here is a site that claims to sell LED's in all colours (including white). One product is listed as "car light". If that means "Headlamp", that should be more than adequate, yes?
     
  9. May 6, 2003 #8
    Thanks guys. The superbrights look interesting... mind you, its looking like they are less Watts than I am after.

    What I need is something that will light up a mountain from around 5 miles away. Like a movie light. Like I said, 50kw to 200kw.

    I don't get the abbreviations on that site...
    "Intensity@20ma"?
    what's "ma"?

    what's 10,000 mcd with relation to intensity?

    Thanks again.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Cool Lights
  1. Laptop Cooling (Replies: 5)

  2. Extreme cooling (Replies: 9)

  3. Pc water cooling (Replies: 7)

  4. Passively cooled PSU? (Replies: 3)

Loading...