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An tunable lamp cap is a special design that can adjust to many kinds of energy-saving bulbs. And with it, it's totally
unnecessay to worry about whether the bulb and the lamp cap will be compatible with each other or not.
The difference from an ordinary lamp holder is that when put in a different bulb,the metal contact place will deform because of the pressure, in which case,it can adjust to different kinds of bulb connectors.