The "고" mark ballast is higher efficiency rate light instrument than general magnetic ballast, especially can use three times longer than electronics ballast.
Same as the advantage of magnetic ballast it has anti-salt and water proof specification due to covered all surface of body with molding.
Also it was made in decrease noisy, size and weight than magnetic ballast.
It has protective circuit and preventive measure for over temperature in it and designed can use for a long term by installing semi conductor for start on lamp.
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