We (most folks I dive with) typically have a permanent bolt snap on the light handle and a loop tied on the rear of the light that a double ender is used with. The front snap is for 'permanently' stowing (failure, pre/post dive, etc) the light with it off. The loop is for temporarily stowing (gas switch, etc) the light and allows it to be on and point down so not to blind others. The double ender is kept on the right chest D ring and removed to attach to the loop then reclipped.
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