We step the mast of our Lancer 25 every time we go out. Far too many times than I want to disclose to mixed company, I failed to unplug my mast wirining and . . . parted it with extreme prejudice. So, on many an occasion, I have a couple of Walmart puck lights back-to-back dangling before the mast. They are MUCH brighter than the boats around me. I tie them to the unused jib halyard and send them up with a messenger. Then I tie the messenger off to the pulpit. This keeps them from banging against the mast and they are less likely to be in the shadow of the mast. But, keep in mind that whatever makeshift anchor light you raise, it probably doesn't satisfy the COLREGs in wavelength or brightness.