while true do
    for i=1,10,1 do
        lamp = lamps[i]
        if (percentage > ((i - 1) * 10)) then
            lamp.setColor(0xFF0000)
        else
            lamp.setColor(0x000000)
        end
    end
    print(percentage)
    os.sleep(1)

    tankinfo = tank.getTanks("unknown")
    percentage = tankinfo[1].amount / tankinfo[1].capacity * 100

end