Lumens per watt to percent of maximum
Type a value in lm/W to get it in % instantly.
14.64%
That's 1.67× as efficient as a fluorescent tube, while a modern LED is 1.2× better. An 800 lumen bulb at that efficiency would draw about 8 watts.
Convert the other way: % to lm/W
What it means
How efficient is that?
The 683 lm/W ceiling is for pure 555 nm green light. Any usable white light must spread across the spectrum, so about 250–350 lm/W is the practical limit.
The math
How to convert lm/W to %
To convert lumens per watt to percent of maximum, multiply by 0.146413.
Example: 100 lm/W × 0.146413 = 14.6413 %.
In the other direction, 1 % = 6.83 lm/W.
Every unit
Your efficacy in every unit
Tables
lm/W to % conversion table
| lm/W | % |
|---|---|
| 5 lm/W | 0.732064 % |
| 10 lm/W | 1.46413 % |
| 15 lm/W | 2.19619 % |
| 25 lm/W | 3.66032 % |
| 50 lm/W | 7.32064 % |
| 75 lm/W | 10.981 % |
| 100 lm/W | 14.6413 % |
| 150 lm/W | 21.9619 % |
| 200 lm/W | 29.2826 % |
| 300 lm/W | 43.9239 % |
| 683 lm/W | 100 % |
% to lm/W conversion table
| % | lm/W |
|---|---|
| 5 % | 34.15 lm/W |
| 10 % | 68.3 lm/W |
| 15 % | 102.45 lm/W |
| 25 % | 170.75 lm/W |
| 50 % | 341.5 lm/W |
| 75 % | 512.25 lm/W |
| 100 % | 683 lm/W |
| 150 % | 1,024.5 lm/W |
| 200 % | 1,366 lm/W |
| 300 % | 2,049 lm/W |
| 683 % | 4,664.89 lm/W |
Quick answers
Quick answers
- How many % is 1 lm/W?
- 1 lm/W is 0.146413 %.
- How many % is 10 lm/W?
- 10 lm/W is 1.46413 %.
- How many % is 100 lm/W?
- 100 lm/W is 14.6413 %.
The units
About these units
Lumens per watt (lm/W)
The standard measure of lighting efficiency.
Percent of maximum (%)
Against the theoretical ceiling of 683 lm/W.
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