Streamlight Super Siege review

We have not tested this lantern. We own none of the products on this site, we have no laboratory, and nothing here is an impression of how it feels in a hand. This review takes every figure Streamlight publishes, runs the arithmetic those figures allow, and says what they do and do not commit the company to.

It also corrects us, and this is the fourth product in a row where that has happened. Until this review, this site recorded the Super Siege's runtime, weight and ingress rating as not published, and said in three separate places that Streamlight published no runtime for it - one of them calling that "disappointing from the one brand that publishes per-mode runtimes on its handhelds". Re-reading Streamlight's own product page on October 13, 2026 showed the brand does exactly what we credit it with everywhere else. It publishes six output-and-runtime pairs, IPX7, a 2 m impact rating, a weight, and the fact that it floats. Every page that said otherwise has been corrected in the same change as this one.

With the real sheet in front of you the product reads differently. The 1,100-lumen headline is the least interesting number on it. The one that matters for an outage is 348 hours.

The published specification

Thirteen published figures. The two missing beam numbers are not a gap on a 360-degree lantern - there is no hotspot to measure, and a beam distance figure would be meaningless. The genuine omission is color rendering, which Streamlight publishes on both of its Switchblade work bars and not here.

Three hundred and forty-eight hours

1 lumen for 348 hours is fourteen and a half days of continuous light. The SOS flash runs 320 hours, or thirteen days. The brighter red mode, 2.7 lumens, runs 140 hours - nearly six days.

One lumen sounds like nothing and is the entire point. It is enough to tell you where the room is, enough to find the stairs, enough to stop a dark house feeling like a hazard - and because it costs almost nothing, it turns a lantern with a sealed rechargeable pack into something that still works on day four of an outage. That is the specific weakness of every rechargeable emergency light, and Streamlight's answer to it is published rather than implied.

This is why we would now argue the red modes are the reason to own this rather than a throwaway feature. Building an outage kit covers how the pieces fit together, and the trade against replaceable cells is laid out in the Streamlight Siege review.

The arithmetic the six figures allow

Six output-and-runtime pairs let you do something the category almost never permits: check whether the modes are internally consistent, and work out what each one actually costs you.

So the practical advice inverts the usual. There is no efficiency reason to sit on medium - use high when you want the room bright and accept it ends sooner. The low mode is the odd one out, delivering about 28 percent less total light across its 36 hours, so 125 lumens is a duration setting rather than an economy setting.

What Streamlight does not publish is the cell capacity, so the watt-hour arithmetic this site normally runs cannot be applied and the power-bank claim cannot be checked against stored energy. How runtime is defined covers the computation where the inputs exist.

It floats, and that is a published specification

Under IEC 60529, IPX7 means submersible in one meter of water for thirty minutes; the X means no dust rating was declared. Streamlight pairs that with a 2 m impact rating and states that the lantern floats.

For a camping or flood-adjacent use case that combination is better than it sounds. A sealed light that sinks is a lost light; one that floats and survives a meter of immersion is recoverable. Among the lights we cover, the Streamlight Siege publishes IPX7 as well, the Klein 56416 publishes IP66 and the Stinger Switchblade only IPX4 - so this is at the strong end. Flashlight versus lantern explains why the format matters more than the output indoors.

The power bank, stated in charges rather than milliamp-hours

Streamlight quantifies the USB output as 4+ full charges for most smartphones and 2+ for most tablets, plus 8+ charges for its own smaller lights. That is a more honest way to state it than a bare capacity figure, because it already accounts for conversion losses - but it is also unfalsifiable, since "most smartphones" is not a specification and the cell capacity is not published.

Treat it as an order of magnitude rather than a number: enough to keep one phone alive across a multi-day outage, not enough to run a household. And remember that every charge you draw out is light you are not getting later - the two functions share one pack.

What it is not

At 868 g this is a heavy object, nearly twice the Siege, and 19 cm tall. It is a thing you place, not a thing you carry. There is no replaceable-cell option, so an eighteen-month stint in a cupboard leaves you with whatever charge survived self-discharge - which is exactly why the Siege, on ordinary cells, still outranks it on our home and outage pages despite publishing half the output.

And no CRI figure. On a lantern you cook and read under, color rendering is a comfort specification rather than a safety one, but Streamlight publishes 90 CRI on both Switchblade bars and the silence here is a choice.

Who should buy something else

Skip it if it will sit unused for a year. A sealed rechargeable is the wrong chemistry for that job. The Streamlight Siege runs on replaceable cells and publishes IPX7 too; a D-cell Maglite publishes 298 hours on its lowest mode and needs no charge maintained at all.

Skip it if you need a beam. A lantern lights everything, including your own eyes, and publishes no candela or beam distance because neither would mean anything. For reach, see tactical flashlights.

Skip it if weight matters. 868 g is a car-trunk or cupboard figure. For camping where everything is carried, headlamps do the same job at a tenth of the mass.

Skip it if you want the cheapest adequate outage light. 1,100 lumens and a power bank is more lantern than a single-room blackout needs, and best flashlights for the home ranks the cheaper options on findability rather than output.

The verdict, stated as what it commits to

On published evidence this is the rechargeable lantern to buy if you will actually keep it charged. Streamlight publishes an output and a runtime for all six modes, IPX7 to a meter, a 2 m impact rating, a weight, that it floats, and a power-bank figure in phone charges - and the six runtimes are consistent enough to show that high mode costs you nothing in total light.

It is heavy, it has no replaceable-cell fallback, it publishes no CRI, and its power-bank claim cannot be checked against a capacity figure. Every one of those is visible in the numbers before you spend anything. For the outage case in full see building an outage kit; for the format argument, flashlight versus lantern.