Heser 4W LED Torch

The Heser 4W LED backup torch is designed as a reserve torch for use in technically demanding dives but performs equally well as a primary torch for everyday diving. Thanks to its good focus, high quality output, high level of reliability and long service life, it is ideal for a variety of diving conditions and activities. LED's have long been a favorite for cave, wreck and ocean divers and this torch is known to be one of the best in its league.

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SKU	HESER
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£149.00
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Description

HESER LED Backup/Primary Torch

The lamp features a high level of insensitivity to vibration thanks to the use of an LED as the lighting source. The device provides a high level of reliability as by design no electronics have been used. It is also suitable for a DIR configuration. It is equally suitable for use as a main diving torch in sport diving.
 
Specifications:

- High light output from the 4 W LED  
- Properly focused beam  
- 27mm outlet diameter  
- High reliability  
- No electronic controls  
- Long Burntime  
- Only 2 parts are in contact with the water --> only one sealing eghe  
- The seal uses 2 O-Rings for added reliability  
- Precision machined top quality  
- Heat produced by the LED is returned to the batteries  
- Textured, nonslip lampbody  
- Simple switch mechanism  
- Usable with primary and rechargeable batteries 

Brighter and Better
 
 
Through the use of an extremely high output 4 W LED, this lamp is much brighter compared to similarily 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 67.2 to 87.2 Fluxi for the same power input. These LED emitters are considerably brighter than the standard LED emitter and share the same burntimes. Since these premium LEDs are not always available from the manufacturer, and quantities are very limited, Selected LED lamps are not always available for sale.
 
The focusing of the LED beam is tight enough to meet the needs of cave divers. Until now, no LED lamp on the market had a tight enough focus for cavediving use. 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 cavediver any good. A tightly focused efficient light beam is also advantageous for normal openwater diving.
 
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. We don't.
 
Robust and Reliable

Since LEDs are shockresistant, and the LED junction emits light almost forever (50000 hours) these lamps are highly reliable.
 
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 Burntime  
 
In 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 burntime increases dramatically. This can be an enormous advantage for a diver who needs light since the burntime 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.  
 
Due to the use of an LED and the elimination of electronic controls, the lamp is capable of providing sufficient light for 8 hours and longer (depending on the type of batteries you select).  
 
All internal parts are precision machined. No cheap metal stampings are used. The Reflector is made from a solid piece of brass. The battery tube is made from an Aluminum tube with 2mm wall thickness and is nickel plated. The Bottom of the battery tube is made from a solid piece of stainless steel. The contact spring is also stainless steel.  
 
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.  
 
The lampbody 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 lamphead is also nonslip.  
 
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.  
 
The lamp can be used with 3 Alkaline "C" Cells or with 3 NiMH Rechargable batteries. (If you use NiMH batteries, you should ask the battery manufacturer if a hydrogen catalyser is required. Use if NiMH batteries is, of course, at your own risk.) Due to the extremely long burntime 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.  
 
Dimensions:

Largest diameter (at the Lamphead) 48mm  
Diameter of the tube 37mm  
Total length 215mm  
Weight without batteries 300gr

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DirDirect is a world-leading online dive shop run by Underwater Explorers based in Portland, Dorset, UK. Underwater Explorers is a dive centre with a striking difference. It was born out of the concept of "Hogarthian" diving, safe and streamlined equipment configuration, using the most robust products available for recreational and technical diving -- but at the same time, keeping it simple. It is based on the concept of "less is more" in diving and acts as an equipment outlet, training facility and source of sound advice.