Broncolor Siros 400 L Wi-Fi / RFS 2.1 Battery Powered 400 W/S Monolight

SKU: BCB3171007 MFR: B-31.710.07
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Key Features

  • Experience superior portability with this battery-powered monolight, perfect for on-location shoots.
  • Achieve consistent, professional results with 400Ws of power output and stable color temperature.
  • Enjoy rapid firing for fast-paced action, thanks to an impressive 0.03-second recycle time.
  • Control your lighting effortlessly using the integrated Wi-Fi and the intuitive bronControl app.
  • Benefit from exceptional durability, ensuring reliable performance in diverse shooting environments.
  • Expand your creative options with broad modifier compatibility for versatile lighting setups.
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Special Order?Estimated to Ship: 03/19/2026
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Reviews about this item

Review Summary

2024-06-30T09:00:14

Rated 5 out of 5

Excellent light - Broncolor for form factor

I selected this over profoto the now ubiquitous choice because of the legendary legacy. The form factor too over PP and thr exposed dome for ligt spread inside a light shaper. Love it so far.

MARK F.

2023-01-30T04:08:34

Rated 5 out of 5

Used gear

Great used item, the description was accurate. Thanks!

Nicholas M.

2020-08-21T15:56:37

Rated 5 out of 5

King of the Battery heads

Power, versatility, Broncolor.

BRISCOE S.

2020-01-14T07:45:16

Rated 5 out of 5

Worth the price

The power, speed, and Broncolor quality of light

Briscoe S.

2018-11-16T04:14:38

Rated 5 out of 5

Punching power

Amazing light. Lots of power but a bit larger than the Profoto B1X. What it lacks in competitive size it makes up for in longer battery life and punching power.

BRANDON R.

2018-11-04T09:22:15

Rated 5 out of 5

Amazing light as expected

I primarily shoot with Profoto B1/B2 flashes when I work on location and tend to use Broncolor Para 88,133,222 quite often with them, however after comparing exposed flash tubes versus the recessed flash tube design, the Siros L was the better option since it has an exposed flash tube to get the full use of the Paras Plus the benefit of being battery powered. Even further, it’s 800ws and still gets well over 220 consistent full powered flashes on one battery. The WiFi function is extremely useful for being able to see the status and flash duration on your mobile device, as well as, having total control over the unit. I was seriously planning to get just one unit but now I’m thinking a second or third might be something to consider in the near future because these things are programmable to work together or alternatively in situations, such as shooting sports where I’d need to have a ton of power at a high rate of speed.

MICHAEL T.

2018-07-26T17:44:01

Rated 5 out of 5

The Best!!!

I love this Mono light I've owner about 4 different lights and this one is the best i've ever owned. Its a yes.

MARLYSS C.

2018-06-13T11:14:04

Rated 2 out of 5

Not helpful for pre-visualize the light

The modeling light of Siros L does not proportionately change with flash power. This is the biggest disadvantage while doing work in studio, where modeling light is used for per-visualize the light pattern and fall of light on the subject. Siros L produce full blast of light whether Actual Flash Power is at Half or Quarter or Lowest Power. I would rather recommend Siros 400 S instead of Siros 400 L. Modeling light of Siros 400\800 S is proportionate with the flash power. Siros S is battery operated, it needs AC Power supply, it will not provide mobility like Siros L.

Sanjib K.

2017-11-10T16:35:09

Rated 5 out of 5

Broncolor siros

I have been a long time broncolor user and this is the best monolight they ever made great battery life, remote transmitter works great and it works with all my reflectors and soft boxes

J S.

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Broncolor Siros L Specifications

  • Maximum Watt/Seconds

    400Ws

  • Control Range

    9 stops in 1/10 or full-stop intervals (2-400Ws)

  • Guide Number

    With L40 Reflector: f/22+5/10 at 6.5' (2 m) and ISO 100
    With P70 Reflector: f/32+5/10 at 6.5' (2 m) and ISO 100

  • Recycle Time

    Eco Mode: 0.04 to 1.9 sec
    Normal: 0.03 to 1.2 sec

  • Flash Duration

    Min. Energy: 1/6,200 sec (t 0.1) / 1/11,300 sec (t 0.5)
    Max. Energy: 1/400 sec (t 0.1) / 1/1,200 sec (t 0.5)
    Speed Mode:
    Minimum Energy: 1/9,200 sec (t 0.1) / 1/19,000 sec (t 0.5)
    Maximum Energy: 1/400 sec (t 0.1) / 1/1,250 sec (t 0.5)

  • Color Temperature

    Max. Energy with P70: 5500K

  • Modeling Light

    25W LED, 3000K color temperature

  • Triggering

    Manual trigger button, photocell, sync cable, built-in Broncolor RFS 2.1 receiver

  • Remote Control

    Using bronControl app for mobile devices, or RFS 2.1 transmitter

  • Flash Ready Indicator

    Visual and audible (switchable)

  • Power

    Li-Ion Battery: 28.8 V / 2.5 Ah / 72 Wh
    Charging: 70 minutes
    Full-Power Flashes: 440

  • Other Functions

    Sequences (flash series) Up to 50 flashes
    USB connection for software updates
    Speed Mode for fastest flash duration

  • User Replaceable Flashtube

    Yes

  • Changeable Reflector

    Yes

  • Auto Dump

    Yes, when power is reduced

  • Operating Temperature

    14 to 140 deg. F / -10 to 60 deg. C

  • Dimensions

    Head: 12.6 x 5.1 x 7.1" / 320.04 x 129.54 x 180.34mm
    Battery: 3.3 x 4.3 x 2.2" / 83.82 x 109.22 x 55.88mm

  • Weight

    Without Battery: 6.8lbs / 3.08kg
    Battery: 1.3lbs / 0.59kg

  • UPC Code

    7640167061129

62 Accessories for Broncolor Siros 400 L Wi-Fi / RFS 2.1 Battery Powered 400 W/S Monolight

  • All Accessories (62)
  • Transmitters & Receivers (3)
  • Light Stands & Accessories (12)
  • Umbrellas & Accessories (7)
  • Bags & Cases (3)
  • Remotes & Accessories (1)
  • Light Controls (2)
  • Gaffer Tape (8)
  • Studio/Still Life & Copy Equip (4)
  • Apple Boxes (2)
  • Light Meters & Accessories (2)
  • Batteries & Power Supply (2)
  • Flashtubes & Lamps (1)
  • Production Accessories (1)
  • Speed Rings & Adapters (7)
  • Softboxes & Accessories (7)

About Broncolor Siros L

FEATURED REVIEWS

Broncolor siros

By J S.

I have been a long time broncolor user and this is the best monolight they ever made great battery life, remote transmitter works great and it works with all my reflectors and soft boxes

Excellent light - Broncolor for form factor

By MARK F.

I selected this over profoto the now ubiquitous choice because of the legendary legacy. The form factor too over PP and thr exposed dome for ligt spread inside a light shaper. Love it so far.

SIROS L - cordless, compact, fast and powerful
The Siros L is broncolor's new battery-powered compact device, which provides ambitious professional photographers with the opportunity to enjoy the perfect lighting, be this in a mobile form in the studio or for external shots - offering up to 440 flashes at full power per battery charge, color constancy and both very fast and also long, flash durations. Easy to control with the bronControl App. Available in 400 and 800 Joules.

Siros L features broncolor HS for syncing at shutter speeds up to 1/8000s. broncolor HS requires an RFS2.2 transmitter, available for Canon, Nikon, and Sony cameras. Existing Siros owners should ensure that their lights the latest user-upgradable firmware has been loaded - available on broncolor's website.

Broncolor Siros L Features

  • 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! A miracle? No, quality!
  • Siros L is fast: In only 0.03 seconds your Siros L is ready again. The flash duration can last less than 1/9000s (t0.1) or 1/19'000s (t0.5). Truly miraculous times.
  • Siros L is simple: Very simple operation using the single rotary controller. Alternatively you can use the advanced, intuitive app. Either way using Siros L is fun.
  • Siros L is powerful: The high light output, up to 800J, leaves no photographer standing in the dark - it can even challenge sunshine.
  • 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.
  • Siros is Swiss: Do you appreciate quality? In Siros L you have Swiss precision and quality - inside and out. Be inspired!
  • Siros L is family: Proven meets innovation! The battery-powered Siros L, the Siros studio lights and Siros S are all available in both 400 and 800 Joule versions. Equipped with the broncolor bayonet fitting, they are part of the best light system in the world.

Product Documents

User Manual

Key Features

  • Experience superior portability with this battery-powered monolight, perfect for on-location shoots.
  • Achieve consistent, professional results with 400Ws of power output and stable color temperature.
  • Enjoy rapid firing for fast-paced action, thanks to an impressive 0.03-second recycle time.
  • Control your lighting effortlessly using the integrated Wi-Fi and the intuitive bronControl app.
  • Benefit from exceptional durability, ensuring reliable performance in diverse shooting environments.
  • Expand your creative options with broad modifier compatibility for versatile lighting setups.

What's in the box:

  • Broncolor Siros 400 L Wi-Fi / RFS 2.1 Battery Powered Monolight
  • Charger
  • Rechargeable Li-Ion Battery
  • Flash Tube
  • Umbrella Reflector
  • Flash Bag 1.1
  • Power Cord
  • Broncolor 2 Year Limited Warranty