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Broncolor Siros 400 L Battery-Powered Monolight

BH #BRS400LWFR2B • MFR #B-31.710.07
Broncolor Siros 400 L Battery-Powered Monolight
Key Features
  • 440 Full-Power Flashes, 400Ws
  • Li-Ion Battery
  • 70-Minute Recharge
  • 0.03 - 1.2 Sec Recycling
The Siros 400 L Battery-Powered Monolight from Broncolor is the latest in the Siros series of monolights. Powered by a Li-ion battery, the flash head gets up to 440 full-power flashes on a 70-minute charge. The modeling light is a 25W LED to conserve battery power.
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Broncolor 400 L Overview

  • 1Description
  • 2Siros L is Battery-Powered
  • 3Siros L is Fast
  • 4Cut-Off Technology
  • 5Speed Mode
  • 6Siros L is Simple
  • 7Siros L is Powerful
  • 8Siros L is LED

The Siros 400 L Battery-Powered Monolight from Broncolor is the latest in the Siros series of monolights. Powered by a Li-ion battery, the flash head gets up to 440 full-power flashes on a 70-minute charge. The modeling light is a 25W LED to conserve battery power.

Speed is central to the design of the Siros L. Recycling is a lightning fast 0.03 to 1.2 seconds, while normal t0.5 flash duration is as short as 1/11300 sec. There's also a Speed Mode that bypasses the Siros L's Enhanced Color Temperature Control to prioritize short flash durations and fast recycle speeds. The result is a flash duration of 1/19,000 at minimum power: fast enough to freeze water droplets and other stop action effects. The Siros L has a 9-stop variable power range from full power all the way down to 2 Ws. While at higher settings it's possible to out-flash the sun, lower settings allow use of even the widest apertures for your desired effect. All functions are available on the simple, intuitive panel via an ergonomic rotary controller, but you also have access to the menus and controls of up to 6 units using your tablet or smartphone and the free bronControl app.

The Siros 400 L features Broncolor HS for syncing at shutter speeds up to 1/8,000s. Broncolor HS requires an RFS2.2 transmitter, available for Canon, Nikon, and Sony cameras. Existing Siros owners should ensure that their lights have the latest user-upgradable firmware, available online at

Siros L is Battery-Powered

A single fully-charged lithium-ion battery stores enough energy for a Siros 400 L to flash more than 440 times, and it does that at maximum power.

Siros L is Fast

In only 0.03 seconds, your Siros L is ready again. The flash duration can as fast as 1/9000 sec (t 0.1) or 1/19000 sec (t 0.5).

Cut-Off Technology

Flash duration and light output are the two decisive factors in light control. A microprocessor in Siros L will calculate the shortest flash duration for a given energy setting.

Speed Mode

In Speed Mode, fast charging and short flash times have absolute priority. In this case, the calculation of constant color temperature (ECTC) is suppressed for quick results.

Siros L is Simple

Very simple operation using the single rotary controller. Alternatively, you can use the advanced, intuitive app.

Siros L is Powerful

The high light output leaves no photographer standing in the dark. It can even challenge sunshine. And with a control range of 9 stops, you can still use wide-open apertures when needed.

Siros L is LED

With its low power consumption, the 25-watt LED module provides bright modeling light at a color temperature of 3200K. The light characteristics are absolutely comparable with the modeling light from a mains-operated Siros S.

Broncolor 400 L Specs

Flash Head
Maximum Power2 to 400 Ws
Power Control9 Stops in 1/10-Stop Increments
Flash Durationt.1: 1/6200 to 1/400 Sec
t.5: 1/11,300 to 1/1200 Sec
Recycle Time0.03 to 1.9 Sec
Color Temperature5500K
Flash Ready IndicatorAudio, Visual
Accessory Fitting TypeBroncolor
Modeling Light
Wattage25 W
Color Temperature3000K
Sync TypeCable, Optical, Radio
Built-In Wireless ReceiverYes
Battery ChemistryLithium-Ion
Maximum Output Voltage28.8 VDC
Capacity (mAh)2500 mAh
Flashes Per Charge440 Flashes (Full Power)
Recharge Time70 Minutes
Weight1.3 lb / 0.6 kg
Auto DumpYes
Operating Temperature14 to 140°F / -10 to 60°C
DimensionsH: 7.1 x W: 5.1 x L: 12.6" / H: 18.0 x W: 13.0 x L: 32.0 cm
Weight6.8 lb / 3.1 kg
Packaging Info
Package Weight15.5 lb
Box Dimensions (LxWxH)22.8 x 11.4 x 10.3"
See any errors on this page? Let us know



Does it support high sync?
Asked by: Felipe B.
Siros L does support 1/8000 shutter speed. You have to configure Siros L in Speed mode.
Answered by: Sanjib K.
Date published: 2018-08-27

Is the modeling lamp proportional to the flash ...

Is the modeling lamp proportional to the flash power? I mean is it possible to adjust it and make it proportional?
Asked by: Anna
The Siros L LED modeling lamp is a fixed power output and cannot be dimmed to be proportional with its flash power setting.
Answered by: [email protected]
Date published: 2019-10-12
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