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M. Mitchell Marmel posted:
RailRide posted:
RJR posted:

You could slip copper tubing over the bulb so light only goes straight out.

Being an LED, doesn't most of the light already go straight out in a relatively narrow cone?

---PCJ

There is some side leakage, particularly in a darkened room:

GEDC2899GEDC2900GEDC2896GEDC2898

Mitch

Hey Mitch, if the side leakage bothers you just paint the sides black!

M. Mitchell Marmel posted:

A little experiment I just did: 

L

Looks unconventional, but works pretty good!

GEDC2891

GEDC2892

Mitch

One of the things that shows up well is the fact that the green is the correct color for signalling. For the technically minded, it is 504nm. Nanometers, that is. This comes from the days of incandescent lamps behind lenses that are almost blue. The yellow filament makes the green color. If you can look at an old real railroad signal you can see the bluish lens. 

Atlas signals use the technically correct LED colors. 

Lou N

RailRide posted:
RJR posted:

You could slip copper tubing over the bulb so light only goes straight out.

Being an LED, doesn't most of the light already go straight out in a relatively narrow cone?

---PCJ

No not necessarily.  An LED die actually emits light from all 6 sides. It is the lensing that focuses the beam. 

I have a project at work that uses LED die for a photodynamic therapy device, an implant that stimulates a pharmaceutical that is injected. The printed circuit board is transparent so light comes out both sides of the board. 

Lou N

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