The light is very even and well distributed. We have used about 100 of these with no problems Correct current and voltage 20mA at 3V We use a 330 ohm resistor in series to power the light at 9VDC.
Pros
Dimensions: 107.5mm x 22.6mm x 2.7mm / 4.2" x 0.8" x 0.1"