Poor boy Diode/Driver Testing Lab

I tried a few searches but haven't found a thread on this.

Thanks to the introduction of the Hyperion LPM I'm wanting to put together a budget/hobby diode testing lab.

Obviously measuring output is covered by the LPM.

Is there an inexpensive way to measure the "nm" of the beam accurately with home built equipment? Cost for various accuracy?

Is there an adjustable pot driver that would be appropriate to use to power a wide variety of diodes being tested?

I see a few options for evaluating the Drivers. Is there an established "best cheap" way to test the drivers?

Thanks guys. If I have good success building/assembling this lab I intend to offer at least a step by step, if not, offer the lab as a kit.