How is lighting performance measured with the ANSI/PLATO FL1 protocol?
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This measurement is taken between 30 and 120 seconds after the headlamp is turned on. It indicates the maximum light output, when the lamp is first turned on, using new batteries.
Lighting distance (meters)
This is the maximum distance between the lamp and the location where only 0.25 lux of illumination remains. The measurement is taken when the lamp is turned on, using new batteries. Lighting distance depends directly on brightness, but mainly on the shape of the beam.
Burn time (hours)
This corresponds to the length of time during which lighting is optimal. It is measured 30 seconds after the lamp is turned on and for as long as the lamp takes to drop to 10 % of maximum light output. Then it switches to reserve lighting.
Reserve lighting ensures a minimum light level for walking. However, the light may not be sufficient for fast-paced activities (such as running, mountain biking, skiing...).
Example of a light output curve for a STANDARD LIGHTING headlamp.