If I had this I would want to put a lens or reflector on the LED. But that looks difficult with the toroid sticking up.
What transistor does this use? Any specs such as the amount of current through the LED and/or the amount of current it draws from the supply? What voltage is the supply? Thank you.
There is no reason that the coil, transistor and resistor cannot be mounted on the bottom side of the board. This would allow you to put a lens around the LED. The transistor is an ss8050. I measured about 500 to 600mA at 1.8V at the input.