We use these in landscape lights that only work with a light switch, so a great find from dusk 'til dawn, except when it's snowing. When the lightbulbs are covered with snow, they start blinking. Our backyard is starting to sound like an SOS like we're signaling for help! It's a pity to turn them off. As soon as we make our way through the snow and scrape the deposits from the light bulb, they work perfectly again. Considering that the winters are sooooooooo long and there is a lot of snow, I can only give these three stars.