Low Battery Charge Level Indication
If battery charge is getting low, then Edna2 will automatically blink the main LEDs to indicate this, a few
seconds after a new setting has been selected. Following this brief warning, operation will continue as normal
with reducing light output as battery is now quite low, and the indicator LED will blink (not visible with helmet
on) at 1 second intervals. Edna2 has been configured to deliver a low light from fundamentally flat battery
packs for some time, therefore minimizing the risk of being left without light. However, at this point you might
consider using a lower light setting, or changing battery.
Ultimately, the Edna2 will restrict illumination to moon mode, and li-ion batteries will shut down at a set low
voltage level (typically around 2.7v) to prevent damage. In event of battery protection circuitry failure, Edna2
incorporates an additional layer of protection to ensure that batteries will not be over discharged
Thermal Management
While operating, Edna2 continually monitors lamp temperature. If lamp gets too hot then main LEDs will blink
and the power will be reduced to allow lamp to cool. White smd indicator LED will blink (not visible with helmet
on) at 1 second intervals while under thermal regulation. Lamp function is not locked, and simply changing
light setting will restore full operation, though be aware that unless a lower light setting is used for a few
minutes in order to provide time for the lamp to cool, then thermal management may quickly reactivate. In
reality, you are probably only likely to see this if running continuously for extended periods, using high settings
and in warm environments; as the Edna2 provides a very effective heat sink.
Edna2 Fitting Guidance
Edna2 is designed to be helmet mounted. Fitting is fairly intuitive. The standard alloy lamp bracket requires 3
holes drilled in the front of the helmet (4.5mm). When drilling, take care not to damage cradle etc, on inside of
helmet. The lamp bracket can be used as a template. Position of lamp bracket is personal preference, and
helmet type dependant. If possible, position lamp high enough to avoid interference with peripheral vision.
Orientate lamp and mark position of lamp bracket central fixing hole, drill helmet, and attach bracket to helmet.
M4 stainless steel hex screws & lock nuts are provided for this. Mark other 2 bracket holes, twist bracket to
one side (or remove completely) and drill helmet. When fixing bracket to helmet, nuts should be on the
outside. The extending arms of the alloy lamp bracket will need to be adjusted to suit lamp and accommodate
curved helmet profile. They can be bent carefully by hand as required.
The Edna2 battery box can be attached with shock cord (suggested 4mm) or two cable ties. This will require
up to 4 suitably positioned holes drilled in helmet, depending on preferred fixing method and helmet design..
The lamp can now be fitted to the lamp bracket. Nora has been designed for cable to run inside the helmet, ,
though many arrangements are possible. The lamp housing and cable can typically be threaded under the
rim of the helmet, behind the cradle inside the helmet and back and out at the front of the helmet, though
many arrangements are possible
The lamp is fitted to the bracket with 2 off M5 cap head screws. The M5 stainless spring washers fit between
the screw heads and the bracket, the M5 stainless washers fit between the bracket and the lamp body.
Orientate lamp to desired angle and lock up both screws, using 4mm allen key. To maintain good water
integrity, high viscosity silicone grease can be used on battery box O ring and front window O ring.
The battery box is opened at the opposite end to the cable gland. Battery and lamp connectors are polarized
so correct polarity is ensured. Battery connections should be made outside of the box, and battery pack
orientated in battery box, with wires and connectors typically orientated down inside wall of box (opposite side
to cable entry). Take reasonable care when fitting battery in order that wires do not get trapped / damaged,
and individual batteries are orientated correctly in Nora battery holders. The battery holder has li-ion protection
circuitry. Take care not to damage this. The cable gland end of the battery holder can be opened for service /
maintenance purposes.
