Yep. There's virtually no limit to what oil-like substance you can use. Part of my cleaning process for any gun I have is wiping down any light that may be present. Re-assembly/lube includes "refreshing" a skim-coat of oil on the flashlight lens. Just enough to dampen a fingertip, and apply; no need to glop it on.
Take a page from the fratboys; too much foam in a beer cup can get knocked down by rubbing your forehead or the bridge of your nose and applying those fingers to the foam. That's stuff in the oils of your skin reacting to the foam (oil = base vs. foam = acid reaction, right?

). Anyhow, we cart oils around on our own repulsive carcasses every day (the same ones that gank up your eye-pro lenses; fingerprints, etc.), and they can be put on your flashlight lens as a barrier for soot.
Stepping away fron Scout lights for a moment:
As stated, with metal bezels, practically any oil is of no impact to the material, but one'd have to take a look at the type of lube being used to make sure it won't damage anything polymer. For example, there are specific cautions in the TMs for polymer AN/PEQ-?? devices and a host of other things made from the same material which specify CLP, as it can make the polymer brittle over time. Any lube or gun-cleaning agent that contains Perchloroethylene and/or Methylene Chloride shouldn't be used on polymers.
Chap Stick is a good call for lenses, too. It has the benefit of being universally available, cheap, something you should probably have on your body or in a range/med kit anyway, and ALSO works very well for re-lubing the red O-rings often found on lights/optics. Black O-rings are usually the silicone-impregnated type and don't need lube; red ones will dry out and require occasional lube.
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