Laura OLPH sent me this link to an article about the Blaze Laserlight. It's cool illuminating the model's hand, above, but what it really does is put a glyph of a bike on the road about five meters (16 feet) in front of the cyclist.
It uses the green laser, which is famously stronger than the common red one. From the article:
The Blaze Laserlight is a front LED headlight that also shines a neon green bike symbol onto the ground 16 feet in front of the bicyclist. That way, drivers know someone’s in their blind spot and hopefully won’t turn into a cyclist’s path.At about $200, it's not cheap. And Laura writes, "I think that by the time the driver figures out where the rider is with respect to the laser image, the driver will have hit the cyclist out of sheer distraction." That may be, and we know that drivers don't see what they're not looking for (that second link is to the famous basketball-gorilla video)... but this thing might actually grab attention. I don't do enough night riding to make it worthwhile, but if I did, I'd be tempted to try it.