Posting for my friend. My laser was super bright at first but then dims. I thought it was the cooling since the copper mount im using (dtr copper blank) is not pressed and has no thermal paste but i checked the current draw and it was actually decreasing instead of increasing (0.172 amps right when I turn it on to 0.169 in around 20 seconds which makes the beam way dimmer) I am using a basic lm317 driver with a 0.5 ohm resistor across the adj and Vout. The diode im using is the m140 m type and i set the bench maximum current to 1.5 and voltage to 6 if that even matters. I have 2 aluminum hs on the mosfet since it was getting really hot before. What should I do?