Lumen | |
---|---|
Unit system | SI derived unit |
Unit of | Luminous flux |
Symbol | lm |
Conversions | |
1 lm in .. | .. is equal to .. |
SI base units | 1 cd⋅sr |
Minimum light output (lumens) | Electrical power consumption (watts) | |||
---|---|---|---|---|
Incandescent | Compact fluorescent | LED | ||
Non-halogen | Halogen | |||
200 | 25 | 3-5 | 3 | |
450 | 40 | 29 | 9–11 | 5–8 |
800 | 60 | 13–15 | 8–12 | |
1,100 | 75 | 53 | 18–20 | 10–16 |
1,600 | 100 | 72 | 24–28 | 14–17 |
2,400 | 150 | 30–52 | 24-30[8] | |
3,100 | 200 | 49–75 | 32[9] | |
4,000 | 300 | 75–100 | 40.5[10] |
Quantity | Unit | Dimension | Notes | |||||
---|---|---|---|---|---|---|---|---|
Name | Symbol[nb 1] | Name | Symbol | Symbol[nb 2] | ||||
Luminous energy | Qv[nb 3] | lumen second | lm⋅s | TJ | The lumen second is sometimes called the talbot. | |||
Luminous flux, luminous power | Φv[nb 3] | lumen (= candela steradians) | lm (= cd⋅sr) | J | Luminous energy per unit time | |||
Luminous intensity | Iv | candela (= lumen per steradian) | cd (= lm/sr) | J | Luminous flux per unit solid angle | |||
Luminance | Lv | candela per square metre | cd/m2 | L−2J | Luminous flux per unit solid angle per unit projected source area. The candela per square metre is sometimes called the nit. | |||
Illuminance | Ev | lux (= lumen per square metre) | lx (= lm/m2) | L−2J | Luminous flux incident on a surface | |||
Luminous exitance, luminous emittance | Mv | lumen per square metre | lm/m2 | L−2J | Luminous flux emitted from a surface | |||
Luminous exposure | Hv | lux second | lx⋅s | L−2TJ | Time-integrated illuminance | |||
Luminous energy density | ωv | lumen second per cubic metre | lm⋅s/m3 | L−3TJ | ||||
Luminous efficacy (of radiation) | K | lumen per watt | lm/W | M−1L−2T3J | Ratio of luminous flux to radiant flux | |||
Luminous efficacy (of a source) | η[nb 3] | lumen per watt | lm/W | M−1L−2T3J | Ratio of luminous flux to power consumption | |||
Luminous efficiency, luminous coefficient | V | 1 | Luminous efficacy normalized by the maximum possible efficacy | |||||
See also: SI·Photometry·Radiometry |
Blood Type | O | A | B | AB |
Probability | 0.45 | 0.41 | 0.10 | 0.04 |
Number of Eggs | 0 | 1 | 2 | 3 | 4 | 5 | 6 |
Probability | 0.2 | 0.1 | 0.1 | 0.25 | 0.25 | 0.05 | 0.05 |