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| • Distance |
| • Method of measuring distance |
| • Runtime |
| • Maximum Effective Distance |
| • Direct Distance |
| • Illuminance |
| • Luminous flux |
| • Luminous intensity |
| • How bright is the flashlight beam and how far can I see with it? |
| • Can the bulb break easily,and can it be replaced? |
| • Why are there different tail-caps? Screw tail-cap and a click tail-cap? |
| • Why does my HID flash when opened? |
| • Why can't I restart my HID directly after switching it OFF? |
| • Why does my high bright LED sometimes flicker? |
| • Distance |
| Distance varies with the location of the observer.
For reference, we have defined two distances based on the observing location: casting location and source location. |
| • Method of measuring distance |
We use the following formula to calculate distance:
E= I/d2
E is illuminance in lux
I is luminous intensity in cd
d is distance in meters
As a standard practice, the illuminance E of the light is measured at 2 meters using a light meter. By manipulating the above formula, we can determine the luminous intensity I (I=E×22). We can also calculate the Direct Distance d where the light produces an illuminance of 0.25lux (d= (I/0.25)1/2). Dividing the Direct Distance by 2, we get the Maximum Effective Distance. |
| • Runtime |
| Flashlight manufacturers claim their flashlights last for tens, even hundreds, of hours. While this may be technically true,
it may also be true that during a majority of this time, the flashlight is producing a dim light which may not meet the high-brightness demands of the user. NexTORCH defines the Runtime as the total time that the flashlight maintains more than 50% of its highest steady luminance. |
| • Maximum Effective Distance |
| The maximum distance that the observer, standing in the dark at the source, can see an object illuminated by the source. |
| • Direct Distance |
| Distance that the observer, standing in the dark away from the source, can see the light emitted by the source. |
| • Illuminance |
| The density of luminous flux on a surface. The standard units of illuminance are the footcandle and the lux. |
| • Luminous flux |
| Energy per unit time of emitted visible wavelengths of light from the source. The standard unit of luminous flux is the
lumen. |
| • Luminous intensity |
| A measure of a light source power in a particular direction. The standard unit of luminous intensity is the Candela (cd). |
| • How bright is the flashlight beam and how far can I see with it? |
| Here are realistic distances based on clear visibility in a totally dark environment. (a) Regular LED(SU5) 3-6 meters (b) High-bright LED (magic Max /Z3/P1/P3/T1/T3/Magic Max II) 30-60 meters (c) 3.6v xenon bulb (RT3/GT6A-R) 50-70 meters (d) 6v Xenon bulb (T6/T6A/GT6A-S.Z6) 60-80 meters (e) 7.2v Xenon bulb (RT7) 75-120 meters (f) 9v Xenon bulb (T9/Z9) 75-120 meters (g) 10w HID 300-500 meters |
| • Can the bulb break easily,and can it be replaced? |
| All NexTORCH flashlights use top quality bulb assemblies,which have gone through an inspection and quality process.All filament bulbs have a limited life span and need to be replaces in time.Every bulbs is factory calibrated in the reflector unit to offer the best per-set beam performance.For this reason the bulb and the reflector need to be replaced as one unit. |
| • Why are there different tail-caps? Screw tail-cap and a click tail-cap? |
| NexTORCH produces different tail-caps for different application. The screw tail-cap was developed for use police and military. The ON/OFF rate can be controlled by the users thumb,thus being very effective for temporarily blinding a person. The click tail-cap is for more common day to day applications where the convenient ON/OFF of the flashlight can be controlled by a simple click. |
| • Why does my HID flash when opened? |
| This is a discharge of ions in the bulb and is nothing to worry about. |
| • Why can't I restart my HID directly after switching it OFF? |
| A delay is needed to extend the lifetime of the bulb. Re-start after 5 seconds. |
| • Why does my high bright LED sometimes flicker? |
| This is an indication from the flashlight that the batteries need replacing. |