cold light?

[peoplesuck]

This is my last post for a while and i was interested in if cold light is possible?(not a bulb) i asked my science teacher and she said that she doesn't think it is until we are able to control nitrogen. I dont know much about this topic and couldnt find much so if this is a stupid question, sorry.

 

[Cognisant]

LEDs don't heat up as far as I know.

 

[Vrecknidj]

Depends on what you mean by cold.

 

[walfin]

Why is it not possible?

http://www.thefreedictionary.com/_/dict.aspx?rd=1&word=cold+light

http://www.rsc.org/Education/Teachers/Resources/Inspirational/resources/7.4.pdf

Unless you also want to ensure that not even a single infrared photon escapes, which is very difficult.