1200 lumens (lm) converted to lux depends on the area over which the light is spread. Assuming the light spreads evenly over 1 square meter, 1200 lm equals 1200 lux (lx).
Lux measures illuminance, how much luminous flux (in lumens) falls on a surface area. Thus, lux = lumens divided by area in square meters. Without specifying the area, lm cannot be directly converted to lux, but for 1 m² area, 1200 lm equals 1200 lx.
Conversion Tool
Result in lux:
Conversion Formula
The formula to convert lumens (lm) to lux (lx) is:
lux = lumens ÷ area (in square meters)
Lux measure how much light hits a surface, while lumens measure total light output. If you know the area illuminated, dividing lumens by that area gives illuminance in lux.
For example, if 1200 lumens of light spreads over 1 square meter:
- lux = 1200 lm ÷ 1 m²
- lux = 1200 lx
If the area were 2 m², lux would be 1200 ÷ 2 = 600 lx. This shows lux depends on surface size, not just lumens.
Conversion Example
- Convert 1500 lm to lux for 1 m² area:
- lux = 1500 ÷ 1 = 1500 lx
- Since area is 1 m², lux equals lumens.
- Convert 800 lm over 0.5 m²:
- lux = 800 ÷ 0.5 = 1600 lx
- Smaller area increases lux value.
- Convert 2000 lm over 4 m²:
- lux = 2000 ÷ 4 = 500 lx
- Larger area reduces lux.
- Convert 1000 lm over 2 m²:
- lux = 1000 ÷ 2 = 500 lx
- Shows how area affects illuminance.
- Convert 500 lm over 0.1 m²:
- lux = 500 ÷ 0.1 = 5000 lx
- Very small area gives high lux.
Conversion Chart
| Lumens (lm) | Lux (lx) [Assuming 1 m²] |
|---|---|
| 1175.0 | 1175.0 |
| 1176.0 | 1176.0 |
| 1177.0 | 1177.0 |
| 1178.0 | 1178.0 |
| 1179.0 | 1179.0 |
| 1180.0 | 1180.0 |
| 1181.0 | 1181.0 |
| 1182.0 | 1182.0 |
| 1183.0 | 1183.0 |
| 1184.0 | 1184.0 |
| 1185.0 | 1185.0 |
| 1186.0 | 1186.0 |
| 1187.0 | 1187.0 |
| 1188.0 | 1188.0 |
| 1189.0 | 1189.0 |
| 1190.0 | 1190.0 |
| 1191.0 | 1191.0 |
| 1192.0 | 1192.0 |
| 1193.0 | 1193.0 |
| 1194.0 | 1194.0 |
| 1195.0 | 1195.0 |
| 1196.0 | 1196.0 |
| 1197.0 | 1197.0 |
| 1198.0 | 1198.0 |
| 1199.0 | 1199.0 |
| 1200.0 | 1200.0 |
| 1201.0 | 1201.0 |
| 1202.0 | 1202.0 |
| 1203.0 | 1203.0 |
| 1204.0 | 1204.0 |
| 1205.0 | 1205.0 |
| 1206.0 | 1206.0 |
| 1207.0 | 1207.0 |
| 1208.0 | 1208.0 |
| 1209.0 | 1209.0 |
| 1210.0 | 1210.0 |
| 1211.0 | 1211.0 |
| 1212.0 | 1212.0 |
| 1213.0 | 1213.0 |
| 1214.0 | 1214.0 |
| 1215.0 | 1215.0 |
| 1216.0 | 1216.0 |
| 1217.0 | 1217.0 |
| 1218.0 | 1218.0 |
| 1219.0 | 1219.0 |
| 1220.0 | 1220.0 |
| 1221.0 | 1221.0 |
| 1222.0 | 1222.0 |
| 1223.0 | 1223.0 |
| 1224.0 | 1224.0 |
| 1225.0 | 1225.0 |
The chart list lumens values with their lux equivalents assuming illumination over 1 square meter. Use it to quickly find lux if you know lumens for area = 1 m². For other areas, divide lumens by that area.
Related Conversion Questions
- How many lux are 1200 lumens spread over 2 square meters?
- What is the lux value of 1200 lm if the light covers 0.75 m²?
- Can 1200 lm produce 1000 lux on a 1.2 m² surface?
- How to convert 1200 lumens to lux for different room sizes?
- If I have 1200 lm, what lux will I get on a 0.5 m² desk?
- What area corresponds to 1200 lux if I have 1200 lumens?
- Does 1200 lm equal 1200 lux always or depends on area?
Conversion Definitions
Lumen (lm): A lumen is a unit measuring the total amount of visible light emitted by a source. It quantifies the perceived brightness to human eyes. The higher the lumens, the brighter the light appears. Lumens do not account for how the light spreads over an area.
Lux (lx): Lux measures illuminance, or how much luminous flux falls on a surface area, expressed as lumens per square meter. It indicates the intensity of light on a surface, showing how bright that surface appears. Lux changes with the size of the surface illuminated.
Conversion FAQs
Why does converting lumens to lux require knowing the area?
Lux measures illuminance, which depends on how much light is spread over a surface. Lumens give total light output, but without knowing the surface size, you can’t determine illuminance (lux). A 1200 lm light spread over 1 m² gives 1200 lx, but spread over 2 m² halves the lux to 600.
What happens to lux if lumens stay constant but area increases?
If lumens stay the same and the illuminated area increases, lux decreases because the same light spreads thinner. For example, 1200 lm over 1 m² is 1200 lx, but over 3 m² is 400 lx. Lux inversely proportional to area.
Is it possible to convert lumens to lux without area information?
No, because lux depends on lumens and the size of the area lit. Without area, you can’t calculate lux directly. You can estimate lux only if you assume or know the illuminated surface area.
How does the shape of the illuminated area affect the conversion?
The shape itself doesn’t affect the lux calculation directly; only the total area matters. Whether the light covers a square, circle, or irregular shape, lux equals lumens divided by the total surface area in square meters.
Can the conversion tool work for different areas?
The tool above assumes 1 square meter area for simplicity. To calculate lux for other areas, you must divide lumens by that area manually or modify the formula to include the area value. Without adjusting for area, the tool results only apply to 1 m².