Ding pointed out that while there are already light attachments available for bicycles, cyclists may still unwittingly leave them behind; but most cyclists wouldn't ride without their helmets, hence the Lumos. And it's obviously not a case of just slapping lights onto a helmet, because those already exist. Instead, the Lumos comes with a dual-button handlebar attachment that lets you toggle either the left or right turn indicator via RF signal; and when you decelerate, the brake light on the back of the helmet automatically lights up, though Ding and Chen are still fine-tuning this part. There's also a set of LEDs on the front side that stays on permanently, so there's little excuse to miss the cyclist at night. According to the product page, a single charge should last up to a week on average use (30 minutes per day); and recharging is simply a matter of plugging in a micro-USB cable.
Even though the Lumos is launching with two sizes on Kickstarter today, it won't come cheap, but there's a good reason for this: it's still a proper cycling helmet that's passed impact tests and meets safety standards -- CPSC in the United States (CPSC 16 CFR Part 1203) and EN1078 in Europe. With the super early bird offer you can nab one for $85 and expect an April 2016 delivery, followed by the $99 batch in May and the $119 batch (or the $190-for-two deal) from June onwards.