how to define the light I need in a room
March 2010:
This question is often asked by clients, when they choose lighting for various premises. Inappropriate choices usually brings the problem with not having enough light in the room. You can always use a formula to calculate the necessary light quantity (in Watts). Multiply the length of the room by its width in meters. This is the room's surface in square meters. Multiplying this number by 15 will give you the amount of light that you need in Watts.
This formula is for standard lamps. You may need even more Watts in your room if your lamps are in dark colors and not transparent enough.
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