Luminous drift looks comfortable, the eyes are not so tired! But the cost is too high, a battery to 3 pieces, some can use 8~10 hours, some not 1~2 hours to change, that is to say, the factory's battery is not all qualified products, a night 2~3 battery cost is too big! The cost of the lamp is low, a charge can be used for several nights, but the light looks floating, I always feel too tired!