Lumens, watts and what actually makes a room bright
Wattage equivalence is a rough translation. Lumens is the measurement.
What this covers
- Watts measure consumption
- Lumens measure light
- Reading equivalence claims
- Efficacy
- How much light a room needs
- One bright source or several dimmer ones
- Beam angle changes perceived brightness
- Dimming and perceived output
- Comparing two bulbs properly
Watts measure consumption
A watt is a unit of power drawn, not light produced. With incandescent bulbs the two correlated closely enough that people used watts as a brightness scale for a century. LEDs broke that relationship by producing far more light per watt.
Lumens measure light
A lumen is a unit of luminous flux – the total light emitted. Comparing lumens between two bulbs is the only accurate way to compare brightness. Every listing here states lumens where the manufacturer provides it.
Reading equivalence claims
A bulb described as sixty-watt equivalent is claiming to produce roughly what a sixty-watt incandescent did, around eight hundred lumens. The claim is a convenience rather than a standard, and it varies between manufacturers. Where both figures are given, trust the lumens.
Efficacy
Lumens per watt describes how efficiently a bulb converts power into light. Higher is better, and it varies considerably between LED products. For fittings that run many hours a day, this is where running cost is actually decided.
How much light a room needs
Brightness requirements depend on room size, ceiling height, wall colour and purpose. A kitchen work area needs substantially more than a bedroom of the same size. Dark walls absorb a great deal of light, which is why the same fitting performs differently in two rooms.
One bright source or several dimmer ones
A single powerful ceiling fixture produces even light and hard shadows. Several smaller sources at different heights produce softer, more usable light, which is why kitchens combine ceiling and under-cabinet lighting rather than relying on one.
Beam angle changes perceived brightness
A narrow beam concentrates the same lumens into a smaller area, so it appears brighter there and leaves the rest darker. Wide beams spread the light. Spotlights and floodlights can share a lumen figure and produce completely different results.
Dimming and perceived output
Dimming reduces light output non-linearly with perceived brightness, so a dimmer set halfway does not look half as bright. This is normal. What is not normal is flicker or buzz, which indicates a bulb and dimmer mismatch.
Comparing two bulbs properly
Same base, same lumens, same Kelvin, same beam angle. Change one variable at a time. Two bulbs that differ in three specifications cannot usefully be compared on price, which is how most disappointing purchases happen.
How this applies when you are buying
Three numbers decide whether a bulb is right. The base code must match the socket. Lumens, not watts, tell you how bright it is. Kelvin tells you the colour: around 2700K is warm, 4000K neutral, 5000K and above is daylight. Mixing colour temperatures in one room is the thing people most often regret.
LED bulbs listed by base type, wattage equivalent, lumen output and colour temperature, in single and multi-packs.
On the shelf at the moment
These come straight from the A & E Bowery Lighting shelf as you read this, not from a list typed when the article was written, so the prices and the availability are current.
- TJOY G9 LED Bulb 4W, 6000K Daylight 10 Pack, 40 Watt Eq, G9 Base, 120V – $18.99
- WASTROYAL ST58 LED Light Bulbs, Shatterproof Edison Bulbs 60 Watt Equivalent – $7.99
- Energetic 24-Pack A19 LED Light Bulb, 60 Watt Equivalent, Daylight 5000K, E26 Medium Base – $20.49
Where to go from here
All of the above is the reasoning we use behind the counter at A & E Bowery Lighting when someone asks. If you are weighing up two options and the listing does not settle it, ask: +1 212-219-3888 during opening hours, or service@bowerylights.shop, answered within one business day.
If you order from us
Standard shipping is a flat $11.95 anywhere in the United States, and it is free once the order passes $99. Weekday orders normally leave A & E Bowery Lighting the next working day, with three to seven business days in transit after that. Unopened items can go back within 30 days of delivery. Shipping Policy · Refund and Returns
Related sections of the shop
Related reading
- Base types: E26, GU10, G9 and how to identify yours – The base code is the one specification where being close is the same as being wrong.
- Colour temperature: choosing between 2700K and 5000K – The number that decides whether a room feels comfortable or clinical.
- Dimming LEDs: why some flicker and how to avoid it – Two components have to agree, and the bulb is only one of them.
Who wrote this
Written by the team at A & E Bowery Lighting, a lighting, bulbs and fixtures shop at 131 Bowery, New York, NY 10002. The guidance here is what we tell customers across the counter, and it is based on the products we actually stock and the questions we are actually asked. Where we are not certain of something, we say so rather than fill the gap. More about the shop · Contact us
