Remark for sport divers
Although the lamp was developed as backup lamp
for cave divers, the lamp is applicable due to
the high light achievement also as main lamp.
It becomes with standard batteries "Baby C" operated.
With on set batteries it is possible to do 6 hours or more
of night diving.
In the case of this the following advantages result:
Technical Description
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.
These premium LEDs are selected by the LED manufacturer
to have a light output from 240lm 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. 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
- 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 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
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.
Long burn time
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).
On holiday you can use it as main light for night dives. Most times
one battery set is enough for all night dives. You do not have to charge
akkus during your holiday or maintain akkus until to the next holiday.
Only 2 parts are in contact with the water --> only one
sealing edge
The outer housing are only two parts. There is only one sealing edge. More
sealing edges would rise the rise of leaking.
The seal uses 2 O-Rings for added reliability
The only opening is sealed with 2 O-Rings, one behind the
other. This reduces the possibility of a seal failure which
can be caused by sediment deposited on the outside O-Ring.
If the outside O-Ring seal leaks, the inner O-Ring will
still be sealing the opening.
Precision machined top quality metal internals
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 Aluminium
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.
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 nonslip.
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 3 Alkaline "C" Cells or
with 3 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.
Technical specifications
Largest diameter (at the lamp head) 48mm
Diameter of the tube 37mm
Total length 215mm
Weight without batteries 300gr
Minimum pressurised to 200 meter
Battery type: Baby C (very common type)
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