Have a look through some of user djozz’s old threads…I know he’s shared photos of his testing setup and the evolution thereof. Besides the power supply and shorter thicker leads, something like an old cpu cooler heatsink or similar that you can screw an mcpcp to, maybe some of the cheap white china thermal paste like GD100 or similar HY brand (fine for testing…actually not bad for most lights other than drying out quickly), maybe a small fan for cooling at times. I’m sure you already know that “rated max output”/current from the manufacturers - for most white emitters - is far lower than what they can actually be driven at and far lower than the majority of our lights drive them at. If you want to do graphing there is good freebie software but I can’t remember what it is…should show up in other emitter test threads here.