FL-1 Explanation

Light Output (Lumens)

Light output is the measurement of luminous flux using an integrating sphere. Total light output is measured with fresh or fully charged batteries and the reading is taken 30 seconds after the light is turned on, to allow LED to stabilize.

Runtime (Hours)

Runtime is calculated as the time from which the total light output is 10% that of the original light output, rounded to the nearest quarter hour.  For alkaline batteries, unless electronic controls are added, there is a natural decay of the light output over time as the voltage is depleted.  For rechargeable batteries the output is maintained at a fairly constant state until the battery charge is depleted.  Compare sample runtimes below for alkaline vs rechargeable.

Peak Beam Intensity (Candela)

Peak beam intensity is a measurement of luminous intensity at the most intense portion of the beam.  Peak beam intensity is a product of the optic design and light source output.  A more focused beam will produce a higher peak beam intensity.  Higher lumens do not always equate to higher peak beam intensity, as the design of the optics can focus or diffuse lights in different ways. It is important to note that the eye does not perceive ‘brightness’ or light intensity linearly.  A 10,000 cd beam will not appear twice as bright as a 5,000 cd beam.

Impact Resistance (Meters)

Impact resistance is tested with drops onto a concrete surface from a specified height, with all common accessories and batteries installed.  This drop is performed on all 6 cubic faces of the product (top, bottom, front, back, left and right).  Failure is analyzed based on damage that inhibits the normal function or safety of the light.

Beam Distance (meters)

Beam distance is the theoretical distance from the light source at which the illuminance is equal to a full moon on a clear night (0.25 lux).  This is a calculated distance, and is calculated using the peak beam intensity value.  As peak beam intensity rises, beam distance rises.  As peak beam intensity falls, beam distance falls.  The relationship is not linear, as the equation is

Ingress Protection (IPX Rating

Ingress protection testing is performed after drop testing, to ensure any damage during drop does not negatively impact the ingress protection level of the product.  Testing is performed for water ingress resistance and dust ingress resistance.  The resistance is rated on the IP rating scale. The rating achieve is displaced as a number IPXX, where the first X is solid (dust) protection level and second X is liquid protection level.  Example: IP54 would have a dust limited ingress protection level and rated to withstand liquid sprays from all directions, such as rain.

Ingress graph

How performance metrics are used and why they matter

Information here