Proper UV lights, fully warmed up after about 45 seconds. They do warm up if left for prolonged periods of time but are still fully touchable and contribut little in the way of heat, most being removed by a fan.
Easy to install, mine are held in place with velcro sticky pads at each end.
They plug into an invertor which in turn connects to a 12v molex.
I suggest using these around UV reactive fans or even coating the edgee of a fan with UV marker.
They look great with no other lighting but other minimal lighting can be added for differing effects.
Consider same colour UV fans rotating at different speeds, with their image reflected back my mirror stuck to the HDD/CD rack cage for a super cool effect.