[metalman]

the meter moves, which takes power, plus the simple fact that all matter is photo active in some way, ie: light will move electrons around in everything we could stretch the whole thing out, and point to increased lift in montgolfiers balloons, durring daylight as solar assisted device, or sail boats, as wind is derived from solar heating, or eating salad the point is that there is nothing new under the sun and that a little absurdity never hurt anyone

[K0balt]

My memories of ancient light meters involved a battery, but I might be conflating those memories with me plugging in a cadmium sulphide photocell to my shiny new analog multimeter. I was like 7 at the time, so who knows.

OTOH I -need- a salad powered calculator.

[metalman]

"I need a salad powered calculator" why?,you have one already..... :) though strictly speaking it's omniverous