I am an electronics noob struggling to understand a circuit I have reverse-engineered from a circuit board. The circuit will power up a spectral lamp with a current control from 0-25 mA. From what I understand, R6 is the current sense resistor and with the 10k pot I am able to control/limit the current on the load. The opamp circuit is what I yet have to figure out. It looks like something between a differential and non-inverting amplifier but unsure what it actually is (it looks different from typical textbook examples). I am also confused by the additional 1k resistor R3 between the inverting input and R6. So far, I have recreated the circuit and it works as expected.
Any tips on where to start would be highly appreciated.
Disclaimer: This is not a high school or college assignment.