Abstract: Two employees were assigned the job of spray painting the interior of four filter vessels, each about 12 feet in diameter and 15 feet high. They were expected to paint two tanks apiece. One employee finished his work and decided to help his coworker. Temporary lighting was furnished by a 500-watt, 120-volt "quartzlite" with a T3 tungsten-halogen lamp. The paint mix had flashpoints of 95 degrees F, base, and 104 degrees F. The spray paint vapors ignited, causing a flash fire of several seconds duration. The two employees were burned over much of their bodies and were hospitalized for their injuries. The vapors could have been ignited by the heat of the lamp or by a fault in the electric circuit.