P3D Re: Viewer Circuitry

[Tom Hubin <thubin@xxxxxxxxx>]

Greg Erker wrote:
> 
> >For the first feature, I will use one white LED per eye, and wire
> >them in parallel so when one burns, the other will still shine.
> 
>   If white LEDs are like red and other single
> colour LEDs don't they last like 100,000 hours?
> So unless you are overdriving them they should
> last a very long time.

The ones I am working with are rated for about 100,000 hours. Not a bad
deal for $2.50 each.
 
> >The white LEDs I got need 50mA each to maximize their brightness,
> >which means the circuit needs to run at 100mA.  That's fairly high,
> >so two 9v batteries in parallel is what I intend to try.  It may even
> >be the case that if I use rechargeable 9v, they will juice-up when I
> >plug the viewer into the wall.  (I'm not sure if this is really true.)
> 
>   Wow that seems high. Aren't most LEDs 20 or
> 25mA maximum current?

I agree that this is very high. It may be a cluster or array of LEDs.
What is the LED manufacturer and model? Any data sheets online? What is
forward voltage (Vf), viewing angle (degrees FWHM), and rated luminous
intensity (mcd or cd)?

I am using
Current Corporation of America type CLP1509-UN Ultra White LED
http://ledpower.com/
Luminous Intensity 3700 mcd
20 degree viewing angle (I measure closer to 13 degrees)   

Tom Hubin
thubin@xxxxxxxxx