peterharvey73
Flashlight Enthusiast
- Joined
- Apr 12, 2011
- Messages
- 1,005
Because there is no first optics (dome lens) on the emitter, so the visual luminance (surface brightness) is increase to n^2 times of the emitter with lens, where n is the refractive index of the lens.
That's incredible.
It's also so simple.
I wonder why they didn't think about de-doming it before???