Looking to add a power on LED to the front panel of my DAC enclosure.
I can source 3mm blue LEDs locally with the following specs.
Forward current 20mA
Forward voltage 3.7V
Viewing angle 40 Deg
Lens: Diffused, uncoloured.
Power supply is 11.6V so I was going to use a 470 Ohm 1/2 watt series resistor.
The thing is that I have no idea of how bright this LED will actually be in real world use.
The last thing I want is a retina scortching laser beam sitting in the equipment rack hence the choice of a diffused lens.
Anyone experienced care to sanity check my choice of LED and resistor value please?