Clearly these jacket cuff lights are something you need. You can't find them in stores because apparently there hasn't been enough demand for stores like The Gap to integrate the lights into their clothing. However, you can send $20 to the inventor and he'll install the lights for you. Bizarre.
Implications - The best part of these nifty jacket lights is that each individual light is cleverly embedded in your jacket cuffs. This makes them both invisible to observers and comfortable. All they need to be activated is a slight amount of gentle sideways pressure. It would definitely be cool to feel like a superhero, and that is certainly the feeling that a jacket like this would offer.