Watts per square meter to micromoles per square meter per second
Type a value in W/m² to get it in µmol/m²/s instantly.
That's 1.17× as bright as a low-light houseplant, while a bright windowsill is 2.3× brighter. Over a 12-hour day that is a light integral of about 3.781 mol/m².
Convert the other way: µmol/m²/s to W/m²
What it means
How much light is that?
Lux and PPFD relate differently for every light source, because lux weights by the human eye. The 54 lux per µmol used here is the daylight figure; a red-heavy LED can be half that.
The math
How to convert W/m² to µmol/m²/s
To convert watts per square meter to micromoles per square meter per second, multiply by 0.218818.
Example: 400 W/m² × 0.218818 = 87.5274 µmol/m²/s.
In the other direction, 1 µmol/m²/s = 4.57 W/m².
Every unit
Your light level in every unit
Tables
W/m² to µmol/m²/s conversion table
| W/m² | µmol/m²/s |
|---|---|
| 10 W/m² | 2.18818 µmol/m²/s |
| 50 W/m² | 10.9409 µmol/m²/s |
| 100 W/m² | 21.8818 µmol/m²/s |
| 200 W/m² | 43.7637 µmol/m²/s |
| 300 W/m² | 65.6455 µmol/m²/s |
| 400 W/m² | 87.5274 µmol/m²/s |
| 600 W/m² | 131.291 µmol/m²/s |
| 800 W/m² | 175.055 µmol/m²/s |
| 1,000 W/m² | 218.818 µmol/m²/s |
| 1,500 W/m² | 328.228 µmol/m²/s |
| 2,000 W/m² | 437.637 µmol/m²/s |
µmol/m²/s to W/m² conversion table
| µmol/m²/s | W/m² |
|---|---|
| 10 µmol/m²/s | 45.7 W/m² |
| 50 µmol/m²/s | 228.5 W/m² |
| 100 µmol/m²/s | 457 W/m² |
| 200 µmol/m²/s | 914 W/m² |
| 300 µmol/m²/s | 1,371 W/m² |
| 400 µmol/m²/s | 1,828 W/m² |
| 600 µmol/m²/s | 2,742 W/m² |
| 800 µmol/m²/s | 3,656 W/m² |
| 1,000 µmol/m²/s | 4,570 W/m² |
| 1,500 µmol/m²/s | 6,855 W/m² |
| 2,000 µmol/m²/s | 9,140 W/m² |
Quick answers
Quick answers
- How many µmol/m²/s is 1 W/m²?
- 1 W/m² is 0.218818 µmol/m²/s.
- How many µmol/m²/s is 10 W/m²?
- 10 W/m² is 2.18818 µmol/m²/s.
- How many µmol/m²/s is 400 W/m²?
- 400 W/m² is 87.5274 µmol/m²/s.
The units
About these units
Watts per square meter (W/m²)
The energy in the PAR band, at about 4.57 µmol per joule of daylight.
Micromoles per square meter per second (µmol/m²/s)
PPFD, the standard for grow lights: photons landing per second.
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