Originally Posted by willwren

Changing green to blue wouldn't be hard. Changing green to red would be quite difficult, and you'd lose alot of light.

For the HUD, this would mean dimmer. And the blue would be dimmer by default as well, simply because the WS is designed to reflect green. It might not be too bad in blue (Andrew would know, he did it), but simply making it appear red with film would be nearly impossible to achieve without poor results.