In the trailer there are quite a few light sources visible. Since Light No Fire is supposed to be about (not) lighting fires and possibly light-level every light source seen is mentioned here.
Blue light
Blue sword gives off blue light.
Skeletons give off blue smoke.
Blue staff gives off blue light.
Blue sword gives off blue light.
Sign gives off blue-ish light
(hard to tell, but it doesn’t look green like the other “Home”-sign. But that might be caused by ‘Level of Detail’-discoloration)
Blue staff gives off blue light.
Green light
Pot and sign give off green smoke/light.
Green flame tower
Statue face gives of green light
Yellow/Orange light
Lamp gives off yellow light.
Orange light inside the house.
Yellow fire arrow.
Orange flame sword.
Orange flame next to house 1
Orange flame next to house 2
Orange flame on tower
Orange fire
Orange torch
Purple light
Giant crab has eyes that give off purple light.
Spooky eyes are purple-ish.
(hard to tell, the horizontal glow looks purple, but it might be orange)