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HESER Backup LED light II Edition,...
HESER Backup LED light II Edition, new version short January 2020
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HESER Backup LED light II Edition, new version short, January 2020
High light output from the 4W LED
Through the use of extremely high output 4W LEDs, this lamp is much brighter compared to similarly sized halogen lamps, and has a longer burntime. Selected LED: These premium LEDs are selected by the LED manufacturer to have a light output from 200 lm for the same power input. These LED emitters are considerably brighter than the standard LED emitter and share the same burn times.
Properly focused beam
The focusing of the LED beam is tight enough to meet the needs of cave divers. This focusing was achieved through a specially manufactured reflector. Until now it was normal for 50% of the available light not to be focused by the reflector/lens combination. This unfocused light spreads out to the sides and doesn't do the cave diver any good. A tightly focused efficient light beam is also advantageous for normal open water diving. Because of this the Heser-Backup is also used as a main light for open water diving.
27mm outlet diameter (27mm)
A large reflector can more efficiently focus the LEDs output than a small reflector. Many LED lamp manufacturers use a smaller, less efficient reflector/lens unit, thereby saving money. Heser does not.
Shock resistant, since LEDs are shockresistant, and the LED junction emits light almost forever (50000 hours) these lamps are highly reliable.
Completely sealed LED unit
The completly sealed LED unit (20 bar) keep on working also in a flooded housing.
Good cooling of the LED
Due to the nickel plated aluminium battery tube efficient cooling of LED is guaranteed. This is not only important for the efficiency of the LED, it is also very important for reliability of the LED. The manufacturer of the LED place many emphasis on importance of adequate cooling for reliable function of the LED. The LED-unit itself don't solve the cooling problem.
No electronic control
The decision to eliminate controlling electronics provides the following advantages for use as a Backup light:
Increased Reliability, electronics can get damaged by water or shock, and become unusable.
Increased burn time, an electrically controlled LED is always using the maximum power that the circuit is designed for. The advantage is constant brightness until the batteries are completely discharged. The battery voltage drops during the discharge cycle, and the control electronics will compensate this drop by increasing current to the LED. Towards the end of the battery discharge cycle the current draw is at the highest level and the batteries rapidly die with little to no warning. Without control electronics the current draw drops along with the battery voltage. The disadvantage is the LED becomes dimmer as the voltage drops. The advantage is the burn time increases dramatically. This can be an enormous advantage for a diver who needs light since the burn time provided by the electronics is no longer working against him. Due to the elimination of control electronics the lamp is capable of delivering enough light for over 8 hours.
Compensation of battery weakness, iIf one of the batteries would become weak, maybe caused by a battery failure, the electronic controller would raise the current to compensate the lake of voltage. Without a controller the current goes down an reduces the load of the batteries. In such a case, the LED burns weaker but much longer.
Heat produced by the LED is returned to the batteries
Usable battery capacity is temperature dependent and drops with low temperatures. If you can use the waste heat of the LED to warm the batteries the available battery capacity increases. This is why this lamp returns the heat produced by the LED to the batteries.
Textured, non-slip lamp body
The lamp body is turned from a solid rod. The axial channels and roughened middle section make the lamp easy to hold with wet hands and gloves. The rubber hood on the lamp head is also non-slip.
Simple switch mechanism
The lamp is switched on by simply turning the lamphead. This joins the reflector to the heat-conducting battery tube which completes the circuit and also conducts heat to the batteries.
Usable with primary and rechargeable batteries
The lamp can be used with 2 Alkaline "C" Cells or with 2 NiMH rechargeable batteries. (If you use NiMH batteries, you should ask the battery manufacturer if a hydrogen catalyser is required. Use is NiMH batteries is, of course, at your own risk.) Due to the extremely long burn time compared to normal lamps, one set of alkaline batteries will probably last for a whole vacation's night dives. Therefore you don't need to provide the care needed to properly maintain a set of rechargeable batteries.