Note - when initially connected to the battery, Nora4 will turn on in moon mode (flood LED at very low
level). The next press of the switch (short or long)
<push>
will turn the lamp off, and the green smd LEDs will
indicate battery charge level.
Nora4 has effectively zero battery consumption when switched off, so there is no particular requirement to
disconnect batteries. However it is always best practice to do so when not in use for more than a few days.
Moon Mode and Battery Charge Level Indicator
Moon mode is provided by the main flood LED, offering a very low light (approx. 5 lumen) for ultimate
duration (200+ hours). Well suited to underground camp, expedition, small passage caving, and emergency.
Moon mode can be selected by a long switch press
<long push>
from lamp
off
setting.
The next press of the switch (short or long)
<push>
will turn the lamp back off. At this point the green smd
LEDs will display level of battery charge for a few seconds, and the flood LED will blink 1 to 5 times. 5 green
LEDs and 5 blinks indicate full charge, with 1 LED and 1 blink indicating very flat (for li-ion batteries). The
blinks are visible underground, on the back of your hand, such that battery condition can be determined
without removing your helmet.
Low Battery Charge
If battery charge is low, then Nora4 will reduce the power of the main LEDs, with the middle green smd
indicator LED on. This will be apparent at higher light output settings first, when battery is under greater
load! Nora4 operation will otherwise continue as normal, and user can switch freely through lamp settings.
When battery charge is very low, Nora4 will briefly blink the main LEDs, and step down to very low flood
output. Nora4 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
changing battery!
Ultimately, 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, Nora4 incorporates an additional layer of protection
to ensure that batteries will not be over discharged. Recharge flat batteries asap to prevent damage.
Thermal Management
While operating, Nora4 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. The green smd indicator LED will scroll (not visible
with helmet on) 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 Nora4 provides an effective heat sink.
