The present invention relates to a braking system. In one embodiment, given an estimated illuminant color, a more optimal illuminant color can be found by projecting this point to a plot of common illuminants to determine the closest point on the plot of common illuminants. Where a Z axis is taken in parallel to a normal line direction to the optical sheet and an X axis is taken in a direction of the row of the cylindrical lens elements, a cross sectional shape of the cylindrical lens elements satisfiesZ=X2}X2))+AX4+BX5+CX6+. Upon turning off the IGBT, the accumulated carriers below the auxiliary base layer are discharged to the emitter electrode via the auxiliary base layer, the carrier discharge electrode, and the MISFET. In one example, the paintball catcher is a flexible paintball catcher extending into the loading chamber and is able to catch the paintball and hold it in a predefined position.