Metal Lamp

Is it a good idea to use a plastic finish in a lamp base metal?
I am doing research for my school project – Im to a lamp-and wondered if I could use plastic as a finish for the pole / base (body) of the lamp? If not, why not – makes effect of light or something? and, if possible why?
The base should be fine as long as not too close to the bulb. If using bulb is less likely to heat up too xx
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