Non-isolated Driver

A non-isolated circuit is one not shielded from the AC power source, which makes electrocution possible.  This type of design is mainly for double-insulated products, such as LED replacements for bulbs, in which the LED and the whole product are integrated and sealed in the non-conductive plastic, making the light fixture safe.

Usually, the driver efficiency of non-isolated driver can reach 91% or more, which is higher than isolated driver whose driver efficiency is usually around 88%. Due to the absence of isolation transformer, non-isolated driver cost less. 

As mentioned above, the structure of the non-isolated driver makes the electrocution possible, so as to guarantee the safety of the lamp adopting this type driver, the lamp shell must be insulation. Besides, non-isolated driver has poor performance in surge, thus leading the driver a bad choice for outdoor lighting fixtures.

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