Stern & Bow lights

[Alansails]

Can anyone advise how the stern and Bow light covers disassemble from the unit?
I want to replace the bulb with an LED bulb but just looking I see no screws and I am Not one for just grabbing and twisting/prying without knowing what I am doing.
We have the Hella lights, I know the anchor light lens just twists off.
Thanks,

 

[Calif. Ted]

Don't even need a screwdriver with the Hella's, on bottom side is a "tab", press up with thumb, remove lens by tilting outward at bottom while depressing the tab. Marvelous engineering concept to me, "no tools required " to change a bulb.

 

[Alansails]

What great design, AND I looked everywhere BUT underneath!
When I get to the boat next I will check it out, Much Thanks!