Lumintop BLF-GT User Manual

Thank you for supporting this
community project. The GT was designed by
BLF, for BLF, and brought to life by top-tier
manufacturer Lumintop. We trust it will
serve you well in whatever your endeavors
might be! - the BLF GT project team
USER MANUAL

Safety precautions


Use only reputable 18650 cells of known origin.
Protected type cells, based on Samsung,
Panasonic/Sanyo, Sony or LG cells,
recommended.

Use a reliable battery charger. Never over-charge
or over-discharge cells.

Cells are used in series, not parallel. It is therefore
important that all cells are identical: Same make,
model, capacity, age, used cycles, and furthermore
charged to the same level.

Remove and recharge cells when the low voltage
indication is given by the GT (repeated step-downs
in light level and eventual shutdown of the light).

The extraordinary energy density that 18650 cells
offers also means that hazardous conditions are
created when a cell is short-circuited or damaged.
Always treat cells with respect and properly
dispose of damaged cells.

The GT is a very high-intensity flashlight. Do not
point the GT directly at a person, animal, moving
vehicles or flammable materials.

When running at higher output levels the head of
the GT will slowly heat. This is normal. In warmer
ambient conditions this temperature may exceed
60ºC, so please take the necessary precautions
when handling the GT.
-1-

Quick start


Load the cell cradles with four 18650 cells each.
Note that the cradles require button-top type cells.
The GT is designed to work with either or both cell
cradles populated. Take care to observe the correct
polarity for each cell.
BLF

Unscrew the tail-cap and insert both cradles. Again
take care with the polarity: Arrows on the cradle
rods must point towards the head of the GT. If
populating only one cradle we recommend placing
it towards the rear, so that the GT balances better
in the hand.

Screw the tail-cap back. The GT will flash twice
when electrical contact is made. Continue to
tighten the tail-cap to a gentle stop. Do not over-
tighten.

All functions are performed using the single side
button. Note that pressing this button continuously
for more than 8 s enters the UI configuration
settings (indicated by the light blinking). If this is
done inadvertently, exit the configuration settings
by simply releasing the button briefly then pressing
it again continuously for about 4 s until all the
resulting blinks stops.
are

The GT comes factory-set to use the RAMPING UI:
From OFF, press&hold the side button. The light
output will ramp up from a very low level to full
power. Release the button when the required light
level is reached. (The full ramp takes about 3 s.)
Use a single-click at any time to turn the GT OFF.
Please see below for further details.

There is a very small drain on the battery while
OFF. This should not be of any concern, but we
recommend removing the cells (or partially
loosening the tail-cap) if the GT will not be used for
several months.

By default the button back-light is illuminated
while the GT is OFF. This is normal and is done to
easily locate the button in a dark environment.
Turning the GT ON, then OFF, in rapid succession,
disables the back-light until the next use. This is
also normal.

For the complete user manual and any questions
you might have about your GT, please visit the GT
support thread on BLF. The link is on the last page
of this manual.
-2-

Default UI: Smooth ramping

This feature-rich UI provides for smooth ramping of the
light output between 0 and 80%, with an easily-
accessible 100% TURBO mode.
Turn the GT ON: single-click the button, GT turns
ON using the previously used
light output level
Ramp light level: press&hold button
Reverse ramp: while ramping in one direction,
release button briefly
press&hold again
Instant TURBO: double-click
Turn the GT OFF: single-click
MOON mode: from OFF: press the button and
release as soon as the GT turns
on
Strobes: double-click for TURBO, and
then double-click again
(Use single-clicks to cycle forward through the different
types of strobes, but you have to be quick: If resting on
a strobe longer than 1.2 s it locks in and the next single-
click is OFF. Press&hold at any time to cycle backwards
through the strobes.)
Battery status: triple-click (4 blinks, a short
pause, then 1 blink would
indicate 4.1 V average per cell,
for example)
Electronic lock-out: four clicks to disable the GT,
same to re-enable the GT
MOMENTARY mode: five clicks (loosen and re-
tighten the tail-cap to return to
normal operation)
Factory reset: triple-click (battery
mode), then double-click
(driver temperature
double-click again (firmware
version mode),
press&hold for about 2 s. Four
blinks confirm a successful
reset.
-3-

Alternative UI: Mode-sets

The GT is factory-set to
contemporary RAMPING user interface, as described in
the previous section. However, the GT can also be
operated using a more conventional MODE-SET style
user interface. (See next section for detail on how to
set UI options).
Using the MODE-SET UI the output does not ramp, it
steps from one mode to the next using single-clicks.
Turn the GT ON: single-click
and
Next mode: single-click before the current
mode 'locks in' (1.2 s)
Previous mode: press&hold
Last mode [100%]: from OFF: press&hold
Turn the GT OFF: single-click button, after resting
on a mode more than 1.2 s
(mode locked in)
Strobes: press&hold
(Use single-clicks to cycle forward through the different
types of strobes, but you have to be quick: If resting on
a strobe longer than 1.2 s it locks in and the next single-
click is OFF. Press&hold at any time to cycle backwards
through the strobes.)
Battery status: from OFF: single-click followed
by press&hold (4 blinks, a short
pause, then 1 blink would
indicate 4.1 V average per cell,
for example)
Electronic lock-out: from OFF: double-click followed
by press&hold, same to re-
enable the GT
Factory reset: from OFF, single-click followed
by a press&hold (battery status
status
mode),
(driver
mode),
double-click again (firmware
version
then
press&hold for about 2 s. Four
blinks confirm a successful
reset.
-4-
operate using the
then double-click
temperature mode),
mode), then