We have lightworms in the garden!
The lightworms are somewhat battery powered however, I fastened some small bicycle lights to my dogs, and left the camera shutte ropen for some 20-30 seconds.
In order to keep the dogs apart, I had one extra white light, that was covered with green cellophane. Unfortunately it also dimmed the green light a little.
Color codes:
Green: Penticton my young deerhound (Greenhorn)
Red: Jaroff, my noble borzoi. (Red Russian)
White: Happy, my Irish Wolfhound (White,,? Innocence? NO! But there is no black light.)