I bought a $5 headband torch from Paddy's Markets and cellophane cut to size to cover. The more layers of film, dimmer the light. Can be regulated to your preference that way.
I also made a mask for a 12V spotlight lantern too. Made a ring of cardboard that slips firmly over the lantern, with some vents cut into the card, and the three layers of cellophane taped on, some 3cm from the lens so it does not melt. Use it when setting up, and remove the mask when packing up.
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