try for 1.5"-2" of attached "meat". but, there are other affordable options that can offer about the same brightness as neon. you may find it more convenient to drop off your vehicle at another location. i know you're probably busy, but when you get the chance, can you please help me? you may not remember all of them, but some will stay in your memory for quite a while. each time his owner turned the camera, the dog still had the same sideways stare and no other facial expressions. the result is a stable long term operation. give me a call to see this beauty! 