I know they are rarely used in outdoor fixtures like shoeboxes, post tops, flood lights, or cobra heads, but were they common indoors? Like in mall recessed cans, low bays, and high bays? Or did those mainly use the clear lamps too.

Because, I’ve seen both in the past, but were coated MH lamps ever common? I know coated HPS lamps are extremely rare, but what about coated metal halide.

They were less common than the clear ones, but they were still fairly common, especially indoors if the lamp was visible, such as high bay fixtures.

I’ve seen both clear and coated bulbs used indoors.