i don't think the OP is abusing the return policy at all, because the OP didn't get the light there with the intention of using it for as long as he was allowed and then return it, he tried it and wasn't happy with it and is going to return it if and/or when he finds one he is happy with...

someone that is abusing the return policy would go into the store and buy the same light with the intention of not keeping it, use it for say 11 and a half months, and then return it. more times than not that same person would rinse and repeat the process, so they'll most likely get another light and repeat the process cause they know they can get away with it. completely different than the OP. after 21+ years of retail management experience, i've seen a LOT of situations like that, the worst one being when i was a SM at PACSUN (who has since filed chapter 11) i had a kid literally take the sneakers off his feet and put them on the counter and said he wanted to return them...