The beacon behind it wears black round rubber caps, about 7 centimeters in diameter more or less, when you put your hand behind you will touch the plugs and pulling back you will reach the lodges of the bulbs.
The bulbs are attached to the caps through elastic wires, you will have to press the wire inward (towards the lighthouse glass) and to the side to release it from the hitch. You will also have to remove the terminal that supplies the current to the bulb, simply goes under pressure but it will be somewhat hard.
It is important not to touch the glass blisters with the fingers and if it is cleaned with a cloth and alcohol or soapy water because at the temperature that the glass of the blister is put, the sweat urea reacts and the bulb the bulb and the parable of the lighthouse, thus reducing the luminosity of the optics.
I have not found images to hang on this thread and make your homework easier. All the best.