adding two bulbs to a clamp on light question

ok for my fuge, can I buy one of those screw in adapters that fits two bulbs into one socket, they sell them everywhere for like 2 bucks. the bulbs I am using are the CF screw in type like in the picture. what i want to do is increase lighting in my HOB fuge and only have room for one clamp on light. Since these bulbs are only like 18W and 27W, but are equal to higher bulbs, what i'm asking basically is by putting two 27W bulbs in there (54W) that shouldn't go over the 100W MAX bulb rating for these fixtures right?
 
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