To improve the lighting in your bedroom you can add some recessed lighting to the bedroom.
I have installed recessed lighting in my bedroom and when needed I turn them on to increase the lighting.
Also I installed higher wattage bulbs in my ceiling fan to increase the lighting and also added a few lamps.
During the day when the sun is shining I open my window blinds and allow sunlight to come in.
I've also considered adding a sunlight through the roof to my bedroom which would do wonders at increasing the light in my room naturally during the day.
But a good floor lamp with more than one bulb can increase the lighting as well.
Having poor lighting in your bedroom or house can lead to eye strain so it's important to have good lighting.