Have you ever looked at the template for lantern illumination in the PHB and wondered "How the hell do I make this in Roll20??" Well wonder no more friend!
!torch help can bring up the help screen for torch, but in this specific case the command was:
!flicker-on 30 15
Edit April 15th 2020: After fiddling with things for a while I can confirm that this still works. In fact while doing so I came up with a new macro that might make things easier. I'm not good enough to figure out how to put 2 things on one button, but it still works out:
/w GM
[Candle](!flicker-on 30 15 on)
[Torch light](!flicker-on 60 30 on)
[Bullseye Lantern Aura](!flicker-on 30 15 on)
[Bullseye Lantern Beam](!torch 80 50 1 --60)
[Lights Off](!snuff)
[Flicker Off](!flicker-off)
This way you don't even need to edit the token itself (though you'll still want "has vision" checked)