Godox QT400IIM Flash Head Instruction Manual
- June 3, 2024
- Godox
Table of Contents
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Godox QT400IIM Flash Head
Foreword
Thank you for purchasing a GODOX product.
Thanks for choosing QTIII series high-speed flash. It has wide-range
applicability, not only perfect for all kinds of studio and workshop
photography, but also good at capturing fast changing actions in a chain of
pictures in highspeed continuous shooting, e.g. action photography, stage
photography, sports photography, scientific photography, etc. In addition, in
fashion or portrait photography, photographers can capture a series of fast
changing facial expressions and amazing moves, and clearly freeze each
fleetingly perfect instant into eternal beauty. Among the benefits you’ll
enjoy
- Ultra-speedy charging, 0.07 -0.9s recycling time
- Achieving 7/SOOOs high-speed sync
- Up to 7 0 shots in one second under high-speed continuous shooting
- Exact output control on LCD panel from 7 /256 to 7 /7
- 40W LED modeling lamp supports step less brightness adjustment
- Outstanding output stability, less than 2% shifts when under the same output
- High color stability, ranging within ±200k (stable mode) between flashes over the entire power range
- Built-in Xl system {2.4G transmission)
- Sl /S2 Receiver Mode
- Delay function
- Mask function
- High qualified LCD panel
Warning
Please read the following warnings in their entirety before using this
product.
Keep these safety instructions where users can read them for ready reference.
- Do not disassemble or modify. Should the product break down, send the defective back to the authorized service center for inspection and maintenance.
- Keep dry. Do not handle with wet hands, immerse in water, or expose to rain.
- Keep out of reach of children.
- Please put the device in a ventilation environment and keep the parts of lighting and heat dissipation holes are unobstructed. Do not use in flammable environment.
- As this product adopts make and break device, please keep it easy to be used.
- No touching the heating parts of this product.
- Please turn off the power and wear insulated gloves before installing and connecting accessories. When replacing the tube or modeling lamp, please make sure that the tube is cool and wear insulated gloves to prevent burns.
- Do not flash directly towards naked eyes (especially those of babies), otherwise it may lead to visual impairment.
- Disconnect from the power supply when it will not be used for an extended period.
Caution
- After 30 continuous flashes at full power, the flash should be cooled down for about 3 minutes. Overheating will occur if it is used continuously without cooling down.
- Do not keep using the modeling lamp for a long time; otherwise flammable accessories attaching to flash head, e.g. softbox will get burnt. A 1 □-minute time is recommended in this case. After 10 minutes, cool it down for 1 minute.
- When using a snoot, do not keep the modeling lamp on for a long time or fire too frequently (not over six times for one minute). Overheating will result in damages for strobe housing and/or studio light.
- Avoid sudden impacts as this can damage the flash tube and/or modeling lamp.
Name of Parts
Body:
- Light Sensor
- Handle
- Bracket
- Direction Adjusting Handle
- Lampshade Button
- LED Modeling Lamp
- Light Tube
- Ventilation
- Glass Lampshade
- Bowen Mount
- Umbrellas Input
- Fan Air Inlet
- Fan Air Outlet
- Power Switch
- Power Socket
- Modeling Button
- GR/CH Button
- MODE/Wireless Button
- Sl/S2 Button
- Beep Button
- RST(Sl/S2+Beep) Combined Button
- Flash Button
- Menu Button
- Modeling Adjustment Button
- DIM Select Dial
- Locking Dial
- Sleeve
LCD Panel:
Accessories
-
Light Body• 1
-
Light Cover• l
-
Glass Protection Cover *l
-
Instruction Manual *l
-
Power Cord *l
-
Lamp Tube *l
Separately Sold Accessories
The product can be used in combination with the following accessories sold
separately, so as to achieve best photography effects: flash triggers and
camera flashes with 2.4G wireless TX functions.Power Inverter, Softbox,
Photographic Umbrella, Light Stand, Barndoor, Beauty Dish, Snoot, etc. 
Operations
Flash Preparation
- Take down the lamp cover, install the light tube and put on the glass protection cover.
- Attach the flash unit on an appropriate light stand. Adjust the mounting bracket for a good angle and make sure it’s tightened and fixed. Use the direction adjusting handle to adjust the flash on a desired direction. Umbrella input is for different photo umbrellas to put in.
Manual Flash
The flash output is adjustable from 1 /1 full power to 11256th power in 1 /10
stop increments. To obtain a correct flash exposure, use a hand-held flash
meter to determine the required flash output.
- Press
button so that is displayed. - Turn the DIM Select Dial to choose a desired flash output amount.
Display Flash Duration
Flash duration refers to the length of time that from flash’s firing to reach
the half peak at maximum. The half peak at maximum is usually expressed as
1=0.5. In order to provide the photographer with more concrete data, this
product adopts t=0.l. The difference between t=0.5 and t=0. l is shown in the
following picture.
- Flash duration will only be displayed in the M mode.
When adjusting the power output from high to low in this mode, Flash Ready
Indicator will blink (the beeper will alarm). Now press the Test Button to
discharge, and the flash can be used as normal.
Stable Color Temperature Mode and High-Speed Flash (speed) Mode
Stable Color Temperature Mode or High-Speed Flash (speed) Mode can be chosen
in the C.Fn-Fl setting. These two modes are effective in M/Multi mode and
ineffective in highspeed sync mode.
Stable Color Temperature Mode default: color temperature ranges within
±200K, which is a good choice for the photographers who pursues stable color
temperature.
High-Speed Flash (speed) Mode: the max flash duration is up to tO.l
=l/267 00, which is perfect for capturing the fast-changing actions. As the
color temperature is a little higher in this mode, please set the camera’s
white balance parameter to the proportional color temperature amount (see the
chart below) or AWB (Auto White Balance).
QT600IIIM
Test Environment| Darkroom
Color Temperature
Test| Equipment| SEKONIC C-800
Testing Method Trigger beyond l meters and average the amount of 3 tests
Flash Duration
(t0.1)| IGBT control the time of turning on the flash
Stable Color Temperature Mode| | High-Speed Flash (speed) Mode
Parameter
Level| Color Temperature CCT(K)| Flash Duration tO l(S)| Parameter
Level| Color Temperature
CCT(K)| | Flash Duration
t0 l(S)
1/256| 5734| 1/6010| 1/256| 8378| | 1/26100
1/256+03| 5760| 1/5560| 1/256+0.3| 8471| | 1/25800
1/256+0.7| 5745| 1/5420| 1/256+0.7| 8024| | 1/24700
1/128| 5729| 1/5170| 1/128| 9335| 7/24100
1/128+03| 5718| 1/4940| 1/128+0.3| 9108| 1/23400
1/128+07| 5686| 1/4830| 1/128+0.7| 9010| | 1/19300
1/64| 5619| 1/4680| 1/64| 8535| 1/16500
1/64+0.3| 5635| 1/4400| 1/64+0.3| 8205| | 7/73900
1/64+0.7| 5657| 1/3970| 1/64+0 7| 7698| | 1/12700
1/32| 5630| 1/3700| 1/32| 7367| 1/11400
1/32+0.3| 5639| 1/3530| 1/32+0.3| 7151| 1/10300
1/32+0.7| 5608| 1/3110| 1/32+0.7| 6856| 1/9500
1/16| 5620| 1/2940| 1/16| 6579| 1/8700
1/16+0.3| 5647| 1/2760| 1/16+0.3| 6440| 1/7800
1/16+0.7| 5657| 1/2360| 1/16+0.7| 6216| | 7/6700
1/8| 5677| 1/2090| 1/8| 6126| 1/5700
1/8+03| 5674| 1/1920| 1/8+03| 6072| 1/5000
1/8+0.7| 5610| 1/1670| 1/8+0.7| 5954| 1/4100
1/4| 5568| 1/1400| 1/4| 5907| 1/3500
1/4+0.3| 5566| 1/1250| 1/4+0.3| 5867| | 1/3000
1/4+0.7| 5656| 1/1060| 1/4+0.7| 5837| | 1/2200
1/2| 5646| 1/900| 1/2| 5844| 1/1600
1/2+0.3| 5681| 1/770| 1/2+0.3| 5738| 1/1200
1/2+0.7| 5649| 1/590| 1/2+0.7| 5636| 1/690
1/1| 5549| 1/530| 1/1| 5539| 1/530
High-Speed Sync
In this mode, you can set the flash output from 1 /1 full power to 1132nd
power in 1 /10 stop increments. High Speed Sync enables the flash to
synchronize with all camera shutter speeds. This is convenient when you want
to use aperture priority for fill-flash portraits.
- Press the
Button so that< IP is displayed. - Turne th DIM Sekect Dial to set the flash output power.
- Please use the transmitter of Xl series (optional).
- With high-speed sync, the faster the shutter speed, the shorter the effective flash range.
- Multi flash mode cannot be set in high-speed sync mode.
- With high-speed sync, the color temperature is lower (decrease around 700K) because of tube’s characteristics. Please set the camera to AWB (Auto White Balance).
Multi: Stroboscopic Flash
In this mode, you can set the flash output from 1 /4th power to 11256th power
in 1 stop increments. With stroboscopic flash, a rapid series of flashes is
fired. It can be used to capture a multiple images of a moving subject in a
single photograph. You can set the firing frequency (number of flashes per
sec. expressed as Hz), the number of flashes, and the flash output.
Multi: Stroboscopic Flash
- Press
button so that is displayed. - Turn the DIM Select Dial to choose a desired flash output.
- Set the flash frequency and flash times.
- Press DIM Select Dial to select the flash times. Turn the DIM Select Dial to set the number.
- Press DIM Select Dial to select the flash frequency.Turn the DIM Select Dial toset the number.
Calculating the Shutter Speed
During stroboscopic flash, the shutter remains open until the firing stops.
Use the formula below to calculate the shutter speed and set it with the
camera.
Number of Flashes/ Flash Frequency= Shutter Speed
For example, if the number of/lashes is 10 and the firing frequency is 5 Hz,
the shutter speed should be at least 2 seconds.
- Stroboscopic flash is most effective with a highly reflective subject against a dark background.
- Using a tripod and a remote control is recommended.
- A flash output of 1 /1 and 1 /2 cannot be set for stroboscopic flash.
- If the number of flashes is displayed as”–“, the firing will continue until the shutter closes is exhausted. The number of flashes will be limited as shown by the following table.
Multi: Stroboscopic Flash
Maximum Stroboscopic Flashes:
Wireless Flash Shooting: Radio (2.4G) Transmission
QTIII adopts built-in 2.4G wireless X system, which is perfectly compatible
with other products of our company. Nikon cameras (using X7 T-N, TT685N, etc.)
and Canon cameras (using X7 T-C, TT685C, etc.) can enjoy one or more QTIII
together. 
- As a receiver unit, QTIII can be controlled by the transmitter unit e.g.
AD360II-C, AD360II-N, TT685 series, V860II series, V7 series, XPro series, X2T
series, XlT series, TT600, etc.
Wireless Flash Shooting: Radio (2.4G) Transmission
Wireless Settings
Press 
Setting the
Communication Channel
If there are other wireless flash systems nearby, you can change the channel
IDs to prevent signal interference. The channel IDs of the transmitter unit
and the receiver unit(s) must be set to the same.
- Long press the <GR/CH> Button for 2 seconds until the channel IDs is blinking.
- Turn the DIM Select Dial to choose the channel from 7 to 32.
- Press the DIM Select Dial to confirm.
Setting the Communication Group 
- Short press the <GR/CH> Button for 2 seconds until the group IDs is blinking.
- Turn the DIM Select Dial to choose the channel from 7 to F.
- Press the DIM Select Dial to confirm.
Receiver Model
Optical Sl Secondary Unit Setting
In M manual flash mode, press <Sl/S2> button so that this flash can function
as an Optical Sl secondary flash with Optical sensor. With this function, the
flash will fire synchronously when the main flash fires, the same effect as
that by the use of radio triggers. This helps create multiple lighting
effects. 
Optical S2
Secondary Unit Setting
Press< Sl/S2> button so that this flash can also function as an Optical S2
secondary flash with Optical sensor in M manual flash mode. This is useful
when cameras have pre-flash function. With this function, the flash will
ignore a single “pre/lash” from the main flash and will only fire in response
to the second, actual flash from the main unit. 
Modeling Lamp
QTIII has a 40W LED modeling lamp whose brightness can be steplessly adJusted.
- Short press the Modeling Lamp Button to choose the modeling lamp’s mode from OFF, Percentage and PROP.
- OFF: Modeling lamp is off.
- Percentage: Adjust the modeling lamp’s light brightness manually from l % to l 00%.
- PROP: The modeling lamp’s power changes with the flash’s power.
The bigger power the flash has, the brighter the modeling lamp is. urn the Modeling Adjustment Button to choose the brightness frorn l % to 100%.
- Tips: Short press the Modeling Adjustment Button can quickly turn on/off the modeling lamp.
- Choose the Modeling Lamp’s Modes
- Short press the MENU Button until Fn menu is displayed.
- Press the OIM Select Dial to choose F4.
- Turn the DIM Select Dial to choose the Modes:
ON: the modeling lamp will keep this status when triggering;
OFF: the modeling lamp will turn off when triggering; Short press the
MENU Button to exit.
Buzz Function
Short press the Buzz Button to turn on/off the Beeper. When the buzz indicator is displayed on the LCD panel, it rneans the sound reminder is turned on; if not dislayed, the sound reminder is turned off. When Buzz function is turned on
- The “Bl” beep will be heard when it’s fully charged.
- The “Bl” beep will be heard when operate the buttons or select dials.
C.Fn: Setting Custom Function
-
Press the Menu Button until
menu is displayed. -
Press the DIM Select Dial to chooes Fn function signs.
-
Turn the DIM Select Dial to change the settings. Short press the MENU buttonto exit.
Custom Function Signs| Function| Setting No.| Settings &
Description| Restrictions
---|---|---|---|---
Fl| Choose mode
flash
| ON| High-Speed Flash (speed) Mode| M/Muli mode
OFF| Stable Color Temperature
F2| Delay flash| OFF,0.07 ~30S| Trigger as second curtain| M/Muli mode
F3| Mask function| OFF| Mask function is off| M mode
Nl| Mask function is on: when setting 2 times’ triggering as a period, the
first triggering will fire a flash
N2| Mask function is on: when setting 2 times’ triggering as a period, the
second triggering will fire a flash.
F4| Modelinglamp
mode
| ON| The modeling lamp will not change its status when triggering| No
OFF| The modeling lamp will turn off when triggering
F5| Wireless ID| OFF| OFF| Wireless mode
07-99| Choose any figure from Ol to99
F6| Swith between fraction and decimal| 7/P| Flash ratio displays in fraction|
No
P.P| Flash ratio displays in decimal
Other Applications
Memory Function
The device is equipped with memory function for the panel setting. It will
help remember the panel setting 3 second after you set it. When starting up
the flash next time, the panel setting will be the same as the status before
powering it off.
Tube Replacement
Shut down the power and remove the power cord before replacing the flash tube
and wear insulated gloves. Then, pull out the old tube gently. Hold two feet
of the new tube, and target directly towards the two copper outlets, then push
them slightly in. Put on the glass protection cover after the tube is
correctly installed. 
Warning
Operating frequency :2412.99MHz – 2464.49MHz (only receive)
Declaration of Conformity
GODOX Photo Equipment Co.,Ltd. hereby declares that this equipment are in
compliance with the essential requirements and other relevant provisions of
Directive 2014/53/EU. In accordance with Article 10(2) and Article 10(10),
this product is allowed to be used in all EU member states. For more
information of Doc, Please click this web link:
https://www.godox.com/DOC/Godox_QTIIIM_Series_DOC.pdf
The device complies with RF specifications when the device used at 0mm from
your body.
Technical Data
Maintenance
- Shut down the device immediately when it works abnormally and find out the reason.
- Avoid sudden impacts and the lamp should be dedusted usually.
- It’s normal for lamp being warm when in use. Avoid continuous flashes when it is not necessary.
- Maintenance of all the flashes is up to our authorized maintenance department which can provide original accessories. Users can replace the flash tube and modeling lamp provided by the manufacturer.
- One year warranty period will be cancelled when any unauthorized maintenance is found.
- If the product had failures or was wetted, it can be continuously used only after it is repaired by professionals.
- Disconnect the power when doing maintenance work or cleaning.
- New changes made to the specifications or designs may not be updated in this manual.
FCC Statement
This device complies with part 15 of the FCC Rules. Operation is subject to
the following two conditions:
- This device may not cause harmful interference, and
- this device must accept any interference received, including interference that may cause undesired operation.
Any Changes or modifications not expressly approved by the party responsible
for compliance could void the user’s authority to operate the equipment.
Note:
This equipment has been tested and found to comply with the limits for a
Class B digital device, pursuant to part 15 of the FCC Rules. These limits are
designed to provide reasonable protection against harmful interference in a
residential installation. This equipment generates uses and can radiate radio
frequency energy and, if not installed and used in accordance with the
instructions, may cause harmful interference to radio communications. However,
there is no guarantee that interference will not occur in a particular
installation. If this equipment does cause harmful interference to radio or
television reception, which can be determined by turning the equipment off and
on, the user is encouraged to try to correct the interference by one or more
of the following measures:
- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and receiver.
- Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
- Consult the dealer or an experienced radio/TV technician for help.
The device has been evaluated to meet general RF exposure requirement. The
device can be used in portable exposure condition without restriction.
Warranty
Dear customers, as this warranty card is an important certificate to apply for
our maintenance service, please fill in the following form in coordination
with the seller and safekeep it. Thank you1
| Product Information | Model | Product Code Number |
|---|
Customer
Information
| Name| Contact Number
Address
Seller Information| Name
Contact Number
Address
Date of Sale
Note:
Note: This form shall be sealed by the seller.
Applicable Products
The document applies to the products listed on the Product Maintenance
Information (see below for further information). Other products or accessories
(e.g. promotional items. give aways and additional accessories attached .etc.)
are not included in this warranty scope.
Warranty Period
The warranty period of products and accessories is implemented according to
the relevant Product Maintenance lnformation. The warranty period is
calculated from the day(purchase date) when the product is bought for the
first time. And the purchase date is considered as the date registered on the
warranty card when buying the product.
How to Get the Maintenance Service
If maintenance service is needed, you can directly contact the product
distributor or authorized service institutions. You can also contact the Godox
after-sale service call and we will offer you service. When applying for
maintenance service, you should provide valid wananty card. If you cannot
provide valid warranty card, we may offer you maintenance service once
confirmed that the product or accessory is involved in the maintenance scope,
but that shall not be considered as our obligation.
Inapplicable Cases
The guarantee and service offered by this document are not applicable in the
following cases:
- The product or accessory has expired its warranty period;
- Breakage or damage caused by inappropriate usage, maintenance or preservation, such as improper packing, improper usage, improper plugging in/out external equipment, falling off or squeezing by external force, contacting or exposing to the improper temperature, solvent, acid, base, flooding and damp environments, etc;
- Breakage or damage caused by non-authorized institution or staff in the process of installation, maintenance, alternation, addition and detachment;
- The original identifying information of product or accessory is modified, alternated, or removed;
- No valid warranty card;
- Breakage or damage caused by using illegally authorized, nonstandard or non-public released software;
- Breakage or damage caused by force majeure or accident;
- Breakage or damage that could not be attributed to the product itself.
Once met these situations above, you should seek solutions from the related responsible parties and Godox assumes no responsibility. The damage caused by parts, accessories and software that beyond the warranty period or scope is not included in our maintenance scope. The normal discoloration, abrasion and consumption are not the breakage within the maintenance scope.
Maintenance and Service Support Information
The warranty period and service types of products are implemented according to the following Product Maintenance Information:
Product Type| Name| Maintenance
Period(month)| Warranty Service Type
---|---|---|---
Parts| Circuit Board| 72| Customer sends the. product to designated site
Battery| | Customer sends the. product to designated site
Electrical parts e.g. battery charger, etc.| 72| Customer sends the, product
to designated site
Other Items| Flash tube, modeling lamp, lamp body, lamp cover, locking device,
package, etc| No| Without warranty
Godox After-sale Service Call 0755-29609320-8062