Pool lightbulbs replacement

[margavsoni]

Need to replace these pool light blub. I am worried if i need to drain pool first or i can just unscrew these screw underwater and take off the entire unit out? What are the best way to replace these light bulbs?

 

[wireform]

Make sure power is off, unscrew the few screws and pull it out as a complete unit. It has enough wire behind it to be able to rest on the top of the pool deck.