Thousands of big rigs are using LED lamps as are just about every new car on the road today. I chose LED lamps not the housings, the bulbs that are TEN TIMES as bright looking at them from a 45 degree angle in the rear. I would suggest reading a book on lighting ergonomics that shows clearly why the intense flash of an LED stands out multiple times greater than an incandescent bulb. Now if you simply want those two lamps to alternate so much the case for brighter or equal lamps - you chose because you like the idea. My intention was not to belittle your project, merely to point out half the candlepower is going to be harder to see and that you could have compensated with using the correct LED lamp. Corn cob style lamps emit bright light 90 degrees to the side.