Light Bulb Shapes
Light bulb shapes vary, from pear shapes to funnel shapes to tube shapes. Each light bulb type has a designation. Examples include: PAR for parabolic aluminized reflector light bulb or T for tube. Many household halogen light bulbs are a MR16, the MR is for 'metallic reflective' light bulb.
Bulb shapes are derived from these names. Several of the more general classes of bulb types are outlined below.