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How is the brightness of the flashlight measured?
2005-06-14 23:13:14
The brightness is measured in LUX, the metric brightness measurement. The brightness of the flashlight is 7400 LUX at zero feet. Zero feet being one inch in front of the lens. To convert to English terms, 1 LUX = 0.929 Foot Candles, and one foot candle is the amount of light one square foot a surface receives when it's one foot away from a candle.
If I shake a Forever Flashlight for more than thirty seconds, ca
2005-06-14 23:14:22
Generally speaking five minutes is the duration, you may get more but, at most only a couple of minutes. The longer you shake it the brighter the light. Keep in mind, once the light dims you can shake it again for 15 to 30 seconds and full power is restored. You will never be without light so long as you are physically able to shake the flashlight. You can not over shake it and because it does not use a conventional bulb you never have to worry about burning the bulb out.
Will a Forever Flashlight work well in adverse conditions?
2005-06-14 23:15:09
The light works in all adverse conditions. It is completely waterproof and it floats. Temperature has no effect. It is made from a high density impact resistant plastic. Even though, it is NOT made to be thrown onto the ground, if dropped it will continue to operate without any adverse effects. We guarantee it or return it for a refund within 30 days of purchase. One note, it is made from high density plastic. As such, there is a tolerance to heat. Like most plastics it will melt if subjected to heat in excess of 140o F.
How can a Forever Flashlight bulb never wear out?
2005-06-14 23:16:06
Because we use a LED source instead of a conventional bulb. The light has been successfully tested and we stand by the claims that these products can cast a visible light up to a mile away.
What is a Lumen?
2005-10-09 16:58:05
Lumen - Measurement of a quantity of light as perceived by the human eye.
As a light source's color temperature increases, less light is required to achieve comparable brightness and visual acuity. The international unit to describe the quantity of light (also called luminous flux). ? That is why several manufacturers use this as a standard benchmark for their illumination tools.
Candle Power (Candelas) Used by lighting designers to calculate the foot-candles illuminating a surface (C.P./distance in feet squared) or Lux illuminating a surface (C.P./distance in meters squared)
Foot-candles -Measurement of light output in candela per square foot. It derives from the early English unit of foot-candle defined as the illuminance on a surface placed one foot from the standard candle. 100 foot-candles is generally considered enough light to perform most tasks.
Lux - Measurement of light output in candelas per square meter. One lumen per square. 10 lux is generally considered enough light to perform most tasks.
These terms are useful to assist in determining the "signature" of the illumination tool you are speaking about. No one term will fully describe the overall usefulness or quality of the emission.
For instance, you can have a light with a tremendous candlepower rating at one point in the pattern, but the rest of the pattern in not useful. I.E. dark spots, splotchy, and/or weak.
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