[Elecraft] Dimmable LED desk lamp

[David Woolley]

The light from white "LEDs" is a mixture of a fairly narrow, blue, peak, 
direct from the LED, and a broad, low, yellow one from the phosphor. 
The fact that they don't excite the phosphor with UV is one of their 
advantages, when compared with CFLs (where the actual physics is also 
pretty much constant current driven).

More expensive ones, will have a red LED as well to give better 
rendition of reds.

A lot of the visible light IS from the LED.

On 07/01/17 12:55, Charlie T, K3ICH wrote:
> The actual light is emitted NOT by the LED itself, but a phosphor coating
> inside the LED which is excited by the LED's output.   Dirt-cheap hand