Difference between LED and LASER power driving

Thread Starter


Joined Apr 14, 2020
Hi, I wanted to know if there are and what are the differences between a power supply for a high power LED and a high power laser diode.
I ask why I would like to know if I can use a schematic for a LED driver also for a laser of similar power.


Joined Jun 22, 2012
Any DC psu will drive a Led or Laser diode as long as it can give the required output in Watts and Amps, usually these are Constant Current driven.


Joined Mar 10, 2018
In both cases a power supply that can sense module T and regulate power/current
being delivered to device.

Regards, Dana.


Joined Jan 11, 2015
Stability and accuracy. A bit too much power into a LED will make it brighter and possibly reduce it lifetime. The same
into a laser can break it instantly (< 1 uSec) as the high optical power blows off pieces of the semiconductor. So can
a static discharge. So a little extra voltage peak on turn on can easily destroy a laser diode.

Also the difference between the correct lasing current and too much may be very small and vary with temperature.
A lot of laser diodes have a feedback photodiode which can be used to sense the laser power and to adjust the
driving power as the temperature changes.