I once was on am outdoors film set where we used 1.5 kW HMIs from Arri to light a night scene. One of the Arris was a bit beaten up and after a while we saw smo

I once was on am outdoors film set where we used 1.5 kW HMIs from Arri to light a night scene. One of the Arris was a bit beaten up and after a while we saw smoke rise from the lamp. Of course we shut the thing off and went to investigate. Turns out the UV filter of the lamp had a slight gap on one side, a reasonably sized pile of insects had gathered there and started burning in the heat. It must have had something to do with the UV because they were really just gathering in that one spot and all other lamps were more or less insect-free.