Heser-Backup "II. Edition" LED Head

Second Edition: The version "II. Edition" has a luminous flux in the range of min 300 lm. The LED head is also pressure-tight up to 20 bar. This increases safety considerably, as the lamp head continues to function safely even when the lamp is flooded.

High light output from the 4W LED

Through the use of a very powerful 4W LED, this lamp has an enormous luminous efficacy in comparison to halogen lamps of comparable size and that with longer burning time.

Properly focused beam

The focusing of the LED beam is tight enough to meet the needs of cave divers. Until now, no LED lamp on the market has a tight enough focus for cave diving 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 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. We don't.

High reliability

Since LEDs are shockresistant, and the LED junction emits light almost forever (50000 hours) these lamps are highly reliable.

The completly sealed LED unit keep on working also in a flooded housing. The LED unit is pressure-tight up to 20 bar.

• Shock resistant
• Completely sealed LED unit

No electronic control

The decision to eliminate controlling electronics provides the following advantages for use as a Backup light:

Electronics can get damaged by water or shock, and become unusable.

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.

If one of the batteries would become week, 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.

• Increased Reliability

• Increased burn time

• Compensation of battery weakness

The relevance of the safety instructions always depends on the degree of difficulty of the dive and its requirements. The same applies to the execution of technical work.These safety instructions can therefore not be considered comprehensive.

• The user must always be provided with the product description.
• The product may only be used for its intended purpose.
• The training and level of knowledge must fully cover the intended use.
• The user's level of training may restrict the intended use.
• If the user does not understand this description or has doubts, he must not use the product.
• These instructions are not a substitute for training.
• Defective, worn or modified products must not be used.
• The contact of normal steel parts with stainless steel parts also leads to rust stains on stainless steel parts.

• Never shine the light directly or indirectly (with or without aids) into the eyes of people or animals.
• Keep the lamp away from children.
• The batteries must always be removed for transportation. If the lamp is well insulated in your luggage, there is a risk of overheating if it switches itself on.
• Overheating may occur if the LED bulb is used in lamps without sufficient cooling equipment.   
• Despite the high reliability of LED lamps, it can happen that an LED fails. This circumstance must be taken into account when designing the redundancy.
• Turn on each lamp once before each dive.
• Batteries are more reliable than rechargeable batteries.
• When new batteries are used, their no-load voltage (= unloaded operation) must be measured with an accuracy of 0.01V. Note this voltage on each battery. Measure the voltage before each demanding dive. If a battery has discharged more than 0.03V, replace the entire set.
• Do not use batteries for demanding dives older than 1 year.
• Buy batteries from suppliers with high throughput to purchase batteries with short battery life.  to get storage time.
• Only use reliable battery types from well-known manufacturers.
• If the lamp will not be used for a long time, remove the batteries, because they can leak.
• Should the lamp actually run full of water during a dive, be very careful when opening, as the lamp may be under high pressure.