No, that's what will make your map/room look bad. If you want your light evenly distributed, use, instead of 1 light with 400 brightness, 20 lights spaced around your room with 20 brightness each. That's just an example though.
*Use the 8x8 grid - Its the best grid for basic Walls, only go smaller for detail.
*Use the Nodraw texture - It helps with fps, preferably build your brushes with nodraw then apply textures.
*Use light_spots and lights in a combination for a better effect.
*Use props - Props make a map look better and complete
*Always tick the flag 'Start Constraint' for weapons - Helps with lag