Hi Geoff,
I'm at Coonabarabran HS.
Seems we are on a similar track.
Light bench seems a good idea, to be honest I never thought of that. My set up has prob's with saturation with the higher temperatures.
Maybe use a cardboard tube (old post-pak tube) that can be extended to block incident light. I will try this after the break.
My ultimate goal is to demonstrate the process behind B-V temperature measures for stars by mearuring the intensity through these filters and comparing this to the BB curves.
As a side the metal-work guys are interested for tempering metals.
