Decorating & interiors
Lighting / Lumens Calculator
Light level is lux; a room's need is its area times the target lux for what happens there. Divide by your bulb's lumens and you have the count.
Calculator
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How it works
Typical targets: living and bedrooms ~150 lux, kitchens and offices ~300, workshops and detail tasks ~500. Total lumens = area x lux; an 800 lm bulb is roughly the old 60 W incandescent.
Frequently asked questions
How many lumens for a living room?
Around 150 lux: a 20 m2 living room wants about 3,000 lm total - four 800 lm bulbs, ideally layered between ceiling, floor and table lamps.
Are lumens the same as watts?
No - watts measure consumption, lumens output. LEDs deliver roughly 80-100 lm per watt, so a 10 W LED replaces the old 75 W bulb.