Lumen is the unit of measurement for luminous flux, or the total amount of visible light emitted by a light source in all directions.
| Light Source | Approx. Lumens |
|---|---|
| Candle | 12 lumens |
| 40W incandescent bulb | ~450 lumens |
| 60W incandescent bulb | ~800 lumens |
| 100W incandescent bulb | ~1600 lumens |
| 10W LED bulb | ~800 lumens |
So, an 800-lumen LED bulb gives the same brightness as a 60W incandescent bulb but uses far less energy.
Watt is a unit of power. It measures how much energy a device (like a light bulb) uses per second.
It does not tell you how bright a bulb is — only how much electricity it consumes.
| Bulb Type | Power (Watts) | Brightness (Lumens) |
|---|---|---|
| Incandescent | 60 W | ~800 lumens |
| CFL | 13–15 W | ~800 lumens |
| LED | 8–10 W | ~800 lumens |
Lux is a measure of illuminance — the amount of light (lumens) that falls on a surface area (like a desk or wall).
Lux = Lumens / Area (in square meters)
A 1000-lumen light shining over 1 square meter = 1000 lux
The same 1000 lumens spread over 10 square meters = 100 lux
| Term | Measures | Unit Symbol | Meaning in Simple Terms |
|---|---|---|---|
| Lumen | Total light output | lm | How much light a bulb gives off |
| Watt | Power consumption | W | How much energy the bulb uses |
| Lux | Light intensity on a surface | lx | How bright a space is lit |
Practical Application
| Use Case | Suggested Lux Level |
|---|---|
| Home (general lighting) | 100–300 lux |
| Office workspace | 300–500 lux |
| Study room/Reading | 500–700 lux |
| Supermarket | 750–1000 lux |
| Operating theater | 10,000+ lux |
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