Broncolor’s New Siros L Promises 440 Full Power Flashes on One Charge

Today, Broncolor is making a new addition to their super high end lighting in the form of the Siros L. They’re billing it as a light for photographer who want no compromises.

For starters, it’s boasting lithium ion tech, ECTC tech, and can produce 440 full power flashes on a single charge. Beyond that, it’s also got a flash duration of up to 1/19,000 and promises consistent color temperature output through the entire range of its power.

More details from the press release are after the jump.

Siros L is a true Broncolor unit, produced for ambitious professional photographers who do not want to make any compromises. Most modern lithium ion technology paired with the ECTC technology known from our high-end power packs makes it possible: 440 flashes with full power, flash duration up to 1/19,00 (t 0.5) and, of course, guaranteed constant color temperature over the entire control range.

Siros L is an absolute mobile unit, either outdoor or on location and corresponds with the photographer’s need for more mobility. However, Siros L can also be optimally used as an additional unit with a Broncolor studio equipment. The 25 watt LED modules offer a bright modeling light with a color temperature of 3000 K. The quality is comparable with the modeling light of our AC powered units.

From the sales launch, Siros L will be available in two power levels, 400 joules and 800 joules. The 400 J version with the smaller dimensions and weight is the option for photographers who are often on the move. The 800 J version is made for photographers who refuse to compromise also with regard to power.

Speed mode (flash times)


2 (1 J)
3 (3 J)
4 (6 J)
5 (12 J)
6 (25 J)
7 (50 J)
8 (100 J) 9 (200 J) 10 (400 J)

t 0.1 (t 0.5) – Speed mode

1/9’000 s (1/19’000 s) 1/8’500 s (1/17’500 s) 1/8’200 s (1/16’000 s) 1/8’000 s (1/15’500 s) 1/7’200 s (1/12’000 s)

1/4’600 s (1/7’000 s) 1/3’000 s (1/3’600 s) 1/1’550 s (1/1’600 s) 1/400 s (1/1’250 s)


2 (3 J)
3 (6 J)
4 (13 J)
5 (25 J)
6 (50 J)
7 (100 J) 8 (200 J) 9 (400 J) 10 (800 J)

t 0.1 (t 0.5) – Speed mode

1/8’700 s (1/18’000 s) 1/8’300 s (1/16’000 s) 1/7’800 s (1/14’500 s) 1/7’300 s (1/13’000 s)

1/5’000 s (1/7’200 s) 1/3’200 s (1/4’100 s) 1/1’800 s (1/2’100 s)

1/800 s (1/900 s) 1/250 s (1/700 s)

Flash energy

400 J

800 J

f-stop at 2 m distance, 100 ISO

with re ector L40 with re ector P70

22 5/10 32 5/10

32 8/10 45 6/10

Flash duration t 0.1 (t 0.5)

min. energy max. energy

with optimum colour temperature 1/6’200 s (1/11’300 s)
1/400 s (1/1’200 s)

with optimum colour temperature 1/4’400 s (1/7’400 s)
1/250 s (1/700 s)

Charging time (at 28.8 V)
(for 100% of selected energy) eco-mode

0.04–1.9s 0.03–1.2s

0.05–4.3s 0.03–2.7s

Number of flashes per battery charge

440 at full energy

220 at full energy

Setting range for flash energy

up to 9 f-stops in 1/10 th. or full f-stop steps 2–400J


Colour temperature

max. energy/P70



Modelling light Colour temperature

Remote control Other features

Weight unit (without battery) Weight battery
Operating temperature range Scope of delivery: Outdoor Kit 2

25W LED 3’000 K

25W LED 3’000 K

Flash release

Manual trigger button, photocell, sync cable, with integral broncolor RFS 2.1

Chris Gampat

Chris Gampat is the Editor in Chief, Founder, and Publisher of the Phoblographer. He also likes pizza.