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How do I calculate lux - the formula?
Lux level = total light output (lumens) / area (square meters)
total light output = lumens per fixture * number of fixtures
number of fixtures = (Lux level * area) / lumens per fixture
You need to look up the manufacturer data for your light fitting to get the lumens per fixture. For example a standard 100W incandescent bulb is around 1400 lumens.
Desired lux level = 175, Room size = 16 m2
Fixtures = 175 * 16 / 1400 = 2
So you'd need 2 100W incandescent light fittings.
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