Halo is a handy light specially dedicated to light-writting. Graffiti artists can conserve their own gesture they have with a spray can. It is possible to change the color and the brightness of the led to change the graffiti’s styles. If the light doesn’t have enough battery, the user must shake it to have energy again.
EVIL LIVE 
is this digital graffiti spray can?
no it’s just a fancy LED light in the form of a spray can so you can take longer exposure shots and “write” with the light