1 constant voltage power supply
1 light source with a repeatable daylight type output
1 Bausch and Lomb monocrhomator
1 step wedge as wide as the output of the monochromator
1 solid mounting plate

That is the high end.

The low end is a strip of Wr 99, 98 and 70 filter mounted over a step wedge. Exposures will show relative R/G/B speeds. This is not quantitative.

PE