The Broncolor Siros 400 L Battery Monolightis 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 www.bron.ch/sirosfirmwareupdate/.

440 Full-Power Flashes, 400Ws    Li-Ion Battery    70-Minute Recharge    0.03 - 1.2 Sec Recycling    Speed Mode Flash Duration: 1/19000 Sec.    High Speed Sync w/ Optional Transmitter    9-Stop Flash Range    Built-In Wi-Fi and RFS Receiver    bronControl App    Up to 50-Shot Flash Sequencing

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.

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).

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.

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.

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

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.

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.

Related Questions and Answers

Q: 1. Can this light be used outdoor? Or only indoor?

A: Siros S is AC only. For a battery version the Siros L is a option.

Q: 2. Can I connect a PocketWizard to this?

A: Yes. The Siros L has a sync port which can be triggered by a plugged in receiver.

Q: 3. I Have Grafit powerpack and various J and unilght heads as well as boxlights and pulsospot4. I prefer monobloc heads. Looks like my studio needs will be met nicely by the Siros L 800’s. My question is do these integrate well with the standard powerpack systems of Broncolor like my Grafit and heads? Ie: color temp and output the same? Fast flash duration settings like 1/7000sec t.1? Modifiers all fit same bayonet mounts? iOS app control, is there a way to include my older pack system?

A: The Broncolor Siros 800 S would have a flash duration of 1/4000 at t.1 and would accept all Pulso/Primo type modifiers. While they can be triggered optically from your current Broncolor pack/head system, you cannot trigger your pack/head system using the bronCONTROL App.

Q: 4. Can you tell me what's HS Flash Tube . I read over the specs and I saw this light goes in HSS only with this HS Flash Tube . Can you tell me if this Flash Tube comes with the Monolight or I have to buy it separately?? If yes can you send to me a link with this HS Flash Tube

A: Unfortunately, the HS flashtube originally offered for the Siros system is no longer in production.

Q: 5. Does this moonlight come with a reflector? If so, which one?

A: The Broncolor Umbrella Reflector for Siros and Siros L Monolights B&H # BRURS is included with this monolight.

Q: 6. So the 2 kit and 3 kits does not come with any trigger?

A: Correct, kits are sold without RFS2.1 / 2.2 transmitters, giving you the option to select either a universal or camera platform specific version.

Q: 7. Hello all, Does any one know what is needed to achieve successful HSS shooting using a Pentax 645Z with this monolight? Aside from swapping in a longer burning bulb, are there any other required firmware/hardware considerations? Anyone having real world on-location experience using hss this light, please tell what you know.I looked at the Profoto B1 option (lower power; no hss provision for Pentax 645), but prefer the Bron., even if I have to bring my own power on location. Thanks everyone in advance!

A: At this time there is no system that allows the Pentax 645Z work in HSS.

Q: 8. Hey is this specific light good foR starters?

A: The Broncolor Siros 400s is a very good strobe. It is not a beginner strobe but is good for beginner to professional use.

Q: 9. "Designed and developed in Switzerland" So where is it manufactured?

A: As per our records, the Broncolor Siros 400 S WiFi/RFS 2.1 Monolight is manufactured in Taiwan. Please note that this is subject to change at any time.

Q: 10. According to the Specs, this monolight's power ranges from 4 to 800 Ws. I would like to buy the 2-light kit for use in a small home studio (600 sq ft) for product photography. I would like powerful lights that can be dialed down to low light output when needed. Can this powerful monolight also be used for low light photography? Thanks in advance.

A: While the power range could work for shooting products, it all depends on the size of your space and the type of products you will be shooting. One thing to keep in mind is that any modifiers used over the monolights can further reduce the output.