Bulbs used in Lightforce lights have been carefully selected to ensure maximum performance and durability. This is done by measuring and qualifying the efficiency in converting watts into *candlepower. This combined with the superior Lightforce reflector is what creates the light output that has made Lightforce famous. For the technically minded: The bulb filament size and shape combined with the reflector design determine the concentration of a focused beam. The shape of the filament will determine the type of Beam, e.g. a vertical filament (VF) bulb will give a circular spot beam, whilst the horizontal filament (HF) will give a slightly oval spot.
