How much light I need ?
Twenty years ago, you’d pick up a light bulb box and see wattage listed – typically 25, 40, 60 or 100 watts. We all knew that a 100-watt incandescent bulb looked brighter than a 25-watt one.
Yet, what we’re seeing isn’t wattage – it’s lumens (wattage is the amount of energy the bulb uses).
To determine the lumens needed for a room:
take the square meters of the room and multiply it by 444.
Room measures 5m x 3m= 15sqm
15sqm x 444 = 6,660 lumens
Look for lighting fixtures or light bulbs that produce a total of 6,600 lumens
Here’s a quick guide to lumens needed by room size – although you can use more lumens for work areas like bathrooms and kitchen islands and less for low-light areas like bedrooms:
Size of Room Number of lumens need (can come from more than one light source)
5sqm 2200 lumens
10sqm 4400 lumens
20sqm 8800 lumens