[MF3D.FORUM:134] Re: Light for viewer question

[Tom Hubin <thubin@xxxxxxxxx>]

Tloc54452@xxxxxxx wrote:
> 
> In a message dated 2000/02/01 15:16:12, jet_lk@xxxxxxxxx writes:
> 
> >What about color balance with the white LED?
> 
> I've got one and it seems a hair bluish.  Also, it seems to be made
> up of a combination of separate colors (not too surprising).  So I
> don't know how good it would go through non-achromatic optics,
> but if you hit a diffuser first, it should be OK.
> 
> John B

I think that what you are saying is that the far field appears bluish
white near the center but maybe yellowish near the perimeter. The near
field may have a somewhat different color distribution. 

I have seen this also in some white LEDs. But some brands are much more
consistent in whiteness, albeit a bluish white. The bluish white is
often called cool white.

Some white LEDs, like those sold by DigiKey, appear more like a tungsten
filament white. They call it warm or soft white.

Tom Hubin
thubin@xxxxxxxxx