Read the datasheets for the LED in question - or if not available datasheets for LEDs of similar construction. In general at high frequencies you can get away with a lot more. If the LEDs are cheap you can afford to experiment!
Read the datasheets for the LED in question - or if not available datasheets for LEDs of similar construction. In general at high frequencies you can get away with a lot more. If the LEDs are cheap you can afford to experiment!