Re: Does the size of a lightbulb effect its energy use?

If you mean physical size, then the answer is no.  The energy used by a light 
bulb is reflected in its wattage rating.  Watts are a measure of the amount of 
power that is used (i.e., consumed) by a device or produced by a device.  
Therefore, more Watts simply means more energy consumption.  In many chandelier 
type fixtures the light bulbs are physically smaller than the bulbs that are 
used in a typical table lamp.  However, you can purchase bulbs for a table lamp 
that consume just 15 W; and you can purchase small chandelier bulbs that are 40 
W and even 60 W.  So, size and enrgy use are unrelated for light bulbs.