Beam Angle in Underwater Lights: Wide, Narrow, and When to Use a Snoot

Beam angle determines how your light spreads — and choosing the right one affects your footage, your photos, and how useful the light is as a dive torch. This guide covers what beam angle numbers actually mean underwater, why 120° and 100° are both valid for video, when a narrow beam earns its place on a rig, and when a snoot is the right call.

What Beam Angle Means

Beam angle is measured in degrees and describes the cone of light emitted from the source. It’s typically measured at the point where the light intensity drops to 50% of its peak (the half-power angle). A wider angle means the light spreads over a larger area; a narrower angle means it concentrates the same energy into a tighter cone, producing a brighter centre at the cost of coverage.

What beam angle doesn’t tell you is brightness — that’s lumens. A 120° light and a 15° light at the same lumen rating will look very different in use: the 120° gives broad even coverage, the 15° gives a concentrated beam that punches much further into the water column.

Wide Angle: 120° and 100°

Both 120° and 100° are wide-angle beams designed for underwater video and photography. In practical use the difference between them is subtle — you’re not going to put a 120° and a 100° light side by side and immediately see a meaningful gap in coverage on most subjects.

The difference comes down to optics and housing design. Fitting a wider lens into a compact light body has physical limits — the lens diameter, the reflector geometry, and the housing all constrain how wide you can push the beam. 120° is achievable in a larger head; 100° may be what’s possible in a more compact form factor. The goal in both cases is the same: even, shadow-free coverage across a wide frame with no hotspot in the centre.

Both angles work for:

• Wide-angle video: Full-frame reef coverage, schools of fish, swim-throughs
• Close-focus wide-angle (CFWA) photography: Getting the lens close to a subject while capturing the reef in the background
• Two-light rigs: Overlapping beams to eliminate shadows and create even ambient-style illumination

For reference, Kraken’s current video/photo lights:

• 120°: Hydra 5000, Hydra 10000, Hydra 12,000, Hydra 18000, Abyss 6000, Abyss 10000, Abyss 20,000, Spectrum 25,000
• 100°: Hydra 6000 V2, Hydra 8000 V2
• 110°: Hydra 3000 V2 WRGBU (wide mode)

Narrow Beams: Dive Torch Design

A narrow beam concentrates light into a tight central hotspot with an outer halo of softer illumination surrounding it. This is the standard design for dive torches, and it’s intentional — it solves problems that wide-angle beams can’t.

All Kraken dive torches use this hot-centre-plus-halo pattern. The hotspot serves three distinct purposes:

Cutting Through Poor Visibility

In low-visibility conditions — silt, plankton bloom, surge-stirred sediment — a wide-angle beam illuminates everything in front of you including the suspended particles, creating backscatter that reduces visible range further. A tight central beam punches through the water column instead of bouncing off it. The concentrated beam reaches further and gives you a usable circle of illumination even when visibility is measured in metres rather than tens of metres.

Peering Into Cracks and Overhangs

Reef diving involves a lot of looking into dark spaces — under ledges, into crevices, behind coral heads. A narrow beam lets you aim precisely into a confined space without flooding the surrounding area with light. You’re directing the photons where you need them, not scattering them across a wide arc. This is where the outer halo earns its role too: it gives you ambient awareness of your surroundings while the hotspot focuses on the point of interest.

Signaling

A tight, bright beam is far more effective for diver-to-diver signaling than a wide flood. In daylight dives, a narrow high-output beam can be seen at significant distance even in bright conditions. The concentrated intensity gets attention in a way that a wide soft light doesn’t.

The Hot Centre and Outer Halo

It’s worth understanding why dive torches produce a halo rather than a perfectly sharp-edged beam. The central hotspot comes from the direct LED output focused by the optic. The halo is produced by light that escapes at the edges of the optic and scatters slightly — it’s dimmer than the hotspot but covers a wider area, giving the diver peripheral awareness without requiring them to sweep the light constantly.

In practice this means Kraken dive torches aren’t pure spotlights — they give you a focused working beam plus enough ambient spillover to navigate comfortably. You get the punch of a narrow beam with the situational awareness of a wider one.

Snooting: Taking Narrow Further

A snoot is a tube or cone that fits over the front of a video light and restricts the beam to a very tight circle — typically 10–30° depending on the snoot design. Where a dive torch’s narrow beam is a practical tool for visibility and navigation, a snoot is a creative tool for underwater photography.

The effect is a precisely controlled spotlight on a single subject — a nudibranch, a blenny poking out of a hole, a shrimp on a coral — with the surrounding reef falling to black. The contrast between the brightly lit subject and the dark background is dramatic and intentional. It’s a technique borrowed from studio portrait photography and adapted for underwater use.

Snooting works best with:

• Macro subjects: Small, stationary animals that you can position the beam on accurately
• Clean backgrounds: The technique is most effective when the background is dark — at depth, or against open water
• Patience: Getting the snoot beam centred on a small subject takes practice. It helps to have a dive buddy hold the snoot light while you operate the camera

The Kraken Snoot fits the Hydra 3000, Hydra 5000, and Abyss 6000 — turning any of those lights from a wide-angle flood into a precision macro tool. If you shoot macro and haven’t tried snooting, it’s one of the bigger creative leaps available in underwater photography.

Choosing the Right Beam for Your Diving

• Wide-angle video or CFWA photography: 120° or 100° flood. Both work. Match to your housing and rig setup.
• General recreational diving, cave or wreck penetration, poor vis: Narrow beam dive torch. The hotspot and halo combination handles navigation and signaling better than any flood light.
• Macro photography with creative control: Snoot on a Hydra 5000 or similar. Accept that positioning takes time; the results are worth it.
• Do everything: A wide flood as your primary shooting light plus a narrow dive torch as a backup and signaling device covers every situation. Most serious divers carry both.

How Beam Angle Fits the Bigger Picture

Beam angle, colour temperature, and CRI are the three specs that together determine whether a dive light is right for your shooting style. Beam angle determines coverage. Colour temperature determines how that light renders on camera. CRI determines how accurately colours reproduce within that light. If you’re still working through the spec sheet, our guides to CRI in underwater video lighting and colour temperature cover the other two pieces.