ANSI-NEMA FL-1: Difference between revisions
no edit summary
(→Manufacturers Who Use FL-1: add JETBeam) |
No edit summary |
||
| Line 17: | Line 17: | ||
===Beam Distance=== | ===Beam Distance=== | ||
The distance in meters at which the flashlight produces a light intensity of 0.25 lux. This is not very bright, about equal to a full moon. This distance is not actually measured. Instead the value is calculated by | The distance in meters at which the flashlight produces a light intensity of 0.25 lux. This is not very bright, about equal to a full moon. This distance is not actually measured. Instead the value is calculated by taking the peak beam intensity measured above, dividing by 0.25 lux, and taking the square root of the result. For example, the Quark AA has a peak beam intensity of 1,622 cd. Divide this by 0.25 to get 6,488. Now take the square root to get 80.55. This agrees with the value on the packaging, which is rounded to 81 meters. | ||
[[File:Eqn-throw.png|center|400px]] | |||
===Water Resistance=== | ===Water Resistance=== | ||