Rear Light Blackburn GridRear Light Blackburn Grid TO BE SEEN The Grid Rear Light has four mode options, you can choose if you need high lumen power or extended run time. Ready for those commuting in the city, riding the open roads, or heading to their local trail. Grid Rear Lights offer plenty of rechargeable power to keep you visible while out riding. FOUR MODES High Solid full power, all the time Constant Pulse high power, always on while pulsing Fast Strobe high alert,