Sure. I bet everyone has. They just forgot how. Now to be helpful
... I bet if you got colored "filters" to place over light sources, you
could expose seeds to say, red, blue, green as well as white and no light
and see what effect that has on seed germination. I bet a more
interesting project would be to look at the effect of light on plant
growth (AFTER seed germination) . . . 'cause as we all know . . . seeds do
not need any light to germinate
(But I guess you're dughter will figure that out) - Good luck, Bennett