I have an old noname 80-100mW 532nm module with a suspected faulty IR diode, it only outputs about 20mW when fed with 450mA!
It used to give out 90mW but a spike from a bad driver might havedamaged it I think.
The diode is a C-mount and it is surprisingly easy to get into the module, cheapies are usually glued shut but this one is different.
What power do you think the diode is (was), 500mW?
Is there any cheap sources for this kind o diode, snoctony on ebay wants 60USD, propably more than the entire module is worth when working!
I want to try to align and get the module working as a learning experience... but not for 60 bucks!