It’s essential to have a tail light on your bike. Even when weight is a concern, it’s necessary to light your bike to protect your butt at sundown. Planet Bike has a new Superflash Stealth. It’s got a 1 watt Blaze LED light plus two eXtreme LEDs for visibility up to a mile.
You generally expect to have a red light, but this clear light flashes red and is visible even in daylight. Cars are getting tricked out with white or clear tail lights, why not bikes? The housing is weatherproof, lightweight and durable. Two AAA batteries provide up to 100 hours of run time. That means forever for casual riders who may turn it on when caught coming back from their rides at sundown or in inclement weather.