A new rectangular ceiling light 2x2 found under Lighting / Misc. Lighting, costs 10. Ideal for small rooms, hospital and clinics where a clean looking light seems to be in the right place. This light is probably one of the best available lights as it replaces having to have 4 lights to produce the same luminance in any room.
Rectangular ceiling light 2x2 (MediaFire)
Rectangular ceiling light 4x1