You want some lighting that will create a bright atmosphere that really gets you energized to workout. The lighting should be somewhat natural so as to imitate natural sunlight so that when your mind and body see the light it will equate it to energy and really get you moving.
If you notice as you drive past gyms, they all have many windows. That is because natural light is the best. It gives the exerciser energy. The second best light is fluorescent lighting.
People like bright room for gym as its energizing. Day light bulbs with full spectrum are widely used for gyms but avoid florescent bulbs as its irritating.
