Do they work outside? I don't have outlets outside to run a heated mat, water bowl etc but I do have a light socket that you plug a bulb in. I saw some heated light bulbs on Amazon but are they as good as the reviews? (I'm sometimes leery of reviews and stars). Anyone know? It is 6 feet to the ground so I'm really i a state trying to find something that will work for the colder colder months ahead. But need something that has very little light and can emit only heat. Please advise. Thank you.