These solar lights for boat docks charge during the day and glow at night so you don't have to run costly power to each light. The solar power dock lights are available in amber, blue, green, red, and white so just specify which one that you want at order time. You may get a solar powered dock light for one mile or two miles. These lights are rated in flashes per minute (FPM) or you may order a steady light. Simply screw this light into your dock and you're ready to go!