Wattage to Lumen Calculator
Buy lights by brightness, not watts. Convert an LED's wattage to lumens and see which old bulb it replaces — or enter the lumens you need to find the LED wattage.
Budget LED ~70-80, good ~90-110, top BEE-rated ~120+ lm/W. Check the pack.
A 9W LED ~800 lm (old 60W bulb); a bright room panel ~3000+ lm.
9W LED at 90 lm/W — replaces roughly a 60W incandescent bulb.
at 90 lm/W. A more efficient LED does it on fewer watts.
Indicative only. Efficacy varies a lot between LEDs, and the real brightness is the lumen figure printed on the pack — always trust that over the watts. Two 9W bulbs can differ by 30% in output. Match the lumens to the room with the lux level calculator.
Related Guides — Deep-dive reading
LED Lighting Explained: Lumens, Watts, CRI & How to Buy Well
Why LED replaced everything else, and how to actually choose one — reading lumens instead of watts, understanding colour temperature and CRI, spotting the efficiency (lumens per watt) that decides your bill, and the quality signs that separate a good LED from a cheap one that fails early.
Electrical & WiringLighting Buying Guide India: How to Buy Fixtures & Bulbs Well (2026)
The practical, non-technical how-to-buy guide for home lighting in India — where to shop, how to read a bulb or fixture pack, the numbers that actually matter, buying by layer and room, spotting quality, and what to avoid so you never buy the wrong light twice.
LightingHome Lighting Design: Layers, Lumens & Room-by-Room Planning
How to light a home well — the three layers of ambient, task and accent light, how much light each room actually needs, why lumens matter more than watts, and a room-by-room plan you can hand to your electrician and designer.
Electrical & WiringRelated Tools — You may also find these useful
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The pool of light a spotlight or downlight throws, from the beam angle and distance, with a guide to the right angle.
Lighting CalculatorColour Temperature Selector
The right Kelvin for each room — warm to cool — with why it fits and the CRI to look for.
Lighting PlannerFixture Quantity Calculator
How many downlights a room needs and the grid to lay them in — rows, columns, wall offset and pitch.
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