Source Four Angle Sans Barrel

I don't have an answer to your question. I can't find the mirror's focal length published anywhere.

It should be pointed out that the manual says "Do not operate the fixtures without a lens installed". I suspect the UL rating is a fond memory if the bits from an exploding lamp aren't retained by the lens.

Good point. Maybe I'll fashion a diaper of mesh or R00 next time.

I just run out of wide lenses and PARs awful fast, so if all I need is NC wash for house lights or lightning flashes, no barrel is better than a 10 or a 19.

Thanks for your input.

Good point. Maybe I'll fashion a diaper of mesh or R00 next time.

I just run out of wide lenses and PARs awful fast, so if all I need is NC wash for house lights or lightning flashes, no barrel is better than a 10 or a 19.

Thanks for your input.

Source4s with no barrels over a house full of patrons is very much against code. As well as the physical containment of the lamp, there might be a UV/IR filter on the lenses that you are losing.

-Tim

I would suggest that the circle of light you're getting is just the cut-off from a combination of the gate or the end of the barrel. I also agree with the others that running the lamp without a lens is both a hazard from flying glass and UV radiation.