Several years ago I bought two items called Lightships which are made by a company called Sollight. They have turned out to be one of the most reliable and trouble free items on board and just do what they are supposed to do. A sailor could not ask for more than that. They are small LED light fixtures that are solar charged. They look like miniature lunar lander or some high tech bug with their three legs and suction cups. The suction cups are there so you can mount them to a hatch like this:
Those suction cups are pretty tenacious too. The units stayed attached to the overhead hatches all season until I pulled them off to be used at home in the winter.
On the opposite side is a small solar panel that charges up the battery contained in the unit and a switch as shown here:
The three position switch allows the unit to switch on two white LEDS for general illumination or a red LED only so that night vision is not ruined while moving about the cabin. The third position is the off position and no light will come on at dusk. I purchased two units three years ago. I use one in the main cabin and the other in the head. I would not say that you'll be able to read by their light but, they will shed enough light so you won't be tripping over things in the middle of the night. The one I installed in the head is about as bright as a night light but, not so bright that it will jolt you awake like the other lights on board will do. Another good thing is you never have to worry about turning them off because they might drain the battery as they shut off at dawn and start charging with the first rays of dawn. They also make it look like someone in the cabin as they turn on at dusk even if you are ashore and therefore can act as a possible deterrent to a thief who does not like to take any chances. They get Capt. Mike's approval because they just plain work.