We collected all such white LED Flashlights we could find for our review. Developments and new entrants into this market are coming so fast, it's difficult to keep up, so inevitably we're going to be a bit behind the power curve for a while.

There are numerous single-LED "key chain" style lights available that operate only via a momentary switch, they do not have a constant on mode. We feel that constant on mode operation is an essential element for any flashlight, so we have not reviewed any new lights which do not have this feature.

NOTE: If you manufacture or distribute an LED Flashlight we haven't covered here, please email us and we'll make arrangements to evaluate your light(s) to add to this review.

Some of these lights claim to be waterproof or water-resistant.?However, with the exception of one manufacturer's product line, these are not truly waterproof in the same sense as we think of a dive light being waterproof.?(Actually, the proper technical term is ubmergible?for which there are accepted standards and tests.)?For the most part these lights don't claim to be waterproof--if you read the fine print.?We tested the lights claiming to be waterproof by submerging them for a few days in four feet of water and all passed that moderate test.?Those claiming to be water-resistant, we submerged in the sink for five minutes.?All did just fine.?We then tested the water resistant lights in the pool as well.?Only a few, as noted, continued working.

Many of the water resistant lights function even though they were flooded inside and drying them out after getting wet is all that is needed to maintain their usefulness.?Failing to do so results in a rusty mess that sooner or later quits functioning.

Shock resistance is another advantage claimed for LEDs. We drop tested the flashlights four times from six feet onto concrete with not a single LED failure and little in the way of any other visible damage to the body of the lights themselves.?That's an impressive showing.

In some instances with tubular design flashlights with multiple AA-cell or larger batteries we had some functional failures. This occurred intermittently and only when dropped squarely on the head or tail. The weight of the batteries combined with the force of impact deformed the positive terminal (the "nipple"), forcing it down into the body of the flashlight. When this occurs, either contact is lost between the batteries or internally there is some sort of damage, either of which can prevent electricity from flowing. This is no different that what can happen with a conventional flashlight of similar design.

While some makers claim the LEDs will last upwards of 100,000 hours, others only claim 50,000. Experts tell us that LED life may vary considerably depending upon how they are powered and what voltage is used.?Many of these lights are pushing more volts through them than the LEDs were originally designed for in an effort to increase light output.?Even so, you should expect the LEDs to last, as we noted above, tens of thousands of hours, even when over-powered to a degree. They can be burned out if too much power is applied, but none of the lights we tested exhibited that problem.

Another significant advantage of LED Flashlights, as noted above, is that battery life is extended far beyond anything we have come to expect, though in our tests actual results varied from manufacturer's claims, both plus and minus.?With no real standards for measuring battery life with this new technology, all claims must be taken with a grain of salt. Moreover, you are rarely comparing apples to apples as light output is also often much less than typical incandescent bulb flashlights.

As the battery charge declines below nominal, the LED doesn't go out, it simply gets dimmer.? In many cases this residual illumination will last again as long or longer than the nominal light output and the flashlight may still be useable for many chores at these reduced light levels.? In many cases battery life overall can be measured in days, not hours.?

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LED Flashlight