Values that bear the ANSI FL1 mark are measured according to the ANSI/NEMA FL 1-2009 standard. Values without the ANSI mark are average values that have been calculated or measured in other ways, and which may vary depending on the lamp unit, the battery or external factors. By changing to the unifying standard-setting ANSI measurement procedures that are now adopted by well-known lamp manufacturers, different data is obtained on light performance and strength, duration and beam throw.
LiteXpress believes that only the best components should be used to make high-quality flashlights. For this reason, we use only premium brand-name LEDs from renowned manufacturers in our lamps. This applies both to the high-brightness high-power LEDs and to the 5-mm LEDs.
Lumen (lm) and Candela (cd)
The terms “lumen“ and “candala“ are both used to measure light intensity. The lumen is a unit of the total light power emitted by a light source, independent of the direction of radiation (in other words, independent of any reflector or lens unit used in the device). By contrast, the candela is a unit for measuring the brightest point in the output beam. In this case the reflector or lens system naturally plays a role because it focuses the light. Accordingly, the lumen rating provides information on the light power of a light source but does not say anything about the focussing of the light beam. The candela specification provides information on the focussing of the light beam, but it does not say anything about the total power of the light source, so that it is not suitable for making direct comparisons with other lights.
Do more watts mean more light?
The watt is a unit of power, equal to the product of voltage and current. Although this is an electrical unit, the relative output power of a flashlight can be roughly assessed by examining its power consumption in watts. However, you should bear in mind that this is only approximately correct because it does not take the efficiency of the light source into account (how well it converts electrical energy into light).
Run time specifications of flashlights with similar configurations can vary considerably between different manufacturers. This results primarily from the use of different measuring methods and definitions and lack of attention to the various technical details. Although LEDs are known for their high efficiency, it is also known that their output intensity decreases after a certain time. This is followed by a period with lower brightness. The output power drops relatively quickly from the 100% level in the initial phase to the 50% level. The 50% phase lasts twice as long as the initial 100% phase. After this, the output power slowly declines to zero. Some manufacturers tend to define the run time of their products as extending to the point when they go out. This specification can be misleading because the flashlight stops emitting useful light long before it goes out.
In the past, LiteXpress was keen to establish a suitable reference value, and measured the end of the lamp’s life as the point in time when the output intensity fell below a minimum level which they had previously defined, i.e. the point when the current flowing through the light source drops below 10 per cent of its initial value. This approach was regarded as more direct and more exact, and it provided a more reliable indication of the lamp’s life.
Today the performance data for LiteXpress products – where accordingly marked – are based on the international ANSI/NEMAFL 1-2009 standard (see below), which has now been adopted by many well-known manufacturers of lights.
Light level control
Depending on the intended use and the configuration of the lamp, various light levels can be selected (e.g. high, medium, low, 100%, 50%, 25%, dimming or blinking), which also affects the battery life.
Special lenses and reflectors provide optimal focussing or dispersion of the light.
The electronic switch with Direct Switch-Off capability allows the lamp to be switched off immediately if it has been in a particular operating mode for more than three seconds. This saves the user the trouble of clicking through the other modes in order to switch off the lamp.
ANSI is the colloquial abbreviation for the guideline developed in the USA as the ANSI/NEMA FL 1-2009 Standard, against which flashlights and headlamps all over the world can be tested and measured for the first time according to precisely defined methods, and performance characteristics can be published with consistent identification.
This standard was developed in collaboration between ANSI (the American National Standards Institute), NEMA (the National Electrical Manufacturers Association) and a committee of different flashlight manufacturers, and it can be adopted voluntarily by all manufacturers of mobile lights. Thanks to the clearly defined rules and consistent method of defining the measurement and identification of performance characteristics with ANSI symbols, both end users and resellers can now compare products from different manufacturers in absolute terms. This applies not only to light output and luminous intensity, but also to the duration and distance of the beam.
Icons from the ANSI/NEMA FL 1-2009 Flashlight Basic Performance Standard:
Sum of all emitted light, expressed in lumens (see above). In the measurement, the light is examined at every possible angle of emission to the light source.
Peak Beam Intensity
Maximum light intensity along the centre axis of a beam of light, measured in candela (see above) and independent of the distance to the light source.
Distance at which the beam of light emitted is still 0.25 lux, measured in metres. For comparison: 0.25 lux is approximately the light of the full moon on a clear night in open countryside.
Time from switching on the lamp (output light power) up to the time at which the light power is only 10% of the output value, commencing the measurement 30 seconds after first switching on the lamp with fresh batteries.
Resistance of the lamp when dropped 6 times from a height of 1 metre on to a concrete surface measuring at least 1 metre x 1 metre.
Protection against penetration of water, graded in the following categories: