On Wed, 26 Jun 2019 17:44:20 -0400, Paul wrote:

Obiwan, use the maths.

Plug in the 2.2V instead of the 1.6V in my example.
The resistor needs to be series-connected to limit
the current flow and reduce LED intensity.

I get the math. But the terminology confuses me. Like forward voltage
drop. What about maximum input voltage. There must be a limit before you
burn it up.