20 watt LED tube light AC or DC

 It is AC LED tube light bulb.

Because in AC LED tube light, there is small circuit is fitted inside LED tube light. 

As we know that all bulb and tube light is glow, when it gets directs current its means DC current or DC voltage.

But in our 230V AC (Alternate Current) is supplied from power house.

So therefore when AC current or voltage come in LED or tube light its rectifies into DC current or voltage with the help of rectifier circuit which present in the LED.

   So simply when AC is input Rectifier circuits presents inside LED bulb which convert AC to DC.