I was standing behind the pillar started the exposure with an RC, holding a orange plexi glas tube with a torch inside. Then i ran through the picture and waved the tube as you can see. After that i used a UV light torch to light up the grafitti. As you can see there is some UV reflective paint in the grafitty. The hole procedure was not that long; 37.3 seconds only. The Camera was setto F5 ISO 500 with 18mm on my 16-35mm F2.8 Canon lens.
Anyhow if you love it as much as i do leave a comment or an upvote
if you have more questions how its done ask me please.
for more of this kind of art look for my pages:
https://lightpainting.world/
https://www.youtube.com/channel/UCTAEwW-fz9br_JaWOiJlWxg
https://www.facebook.com/GunnarsPhotos
https://www.instagram.com/gunnarheilmann