The Kraken Sports Hydra 4000 WRGBU is a compact, versatile underwater video light delivering 4,000 lumens of continuous output with a wide 100° underwater beam and high CRI 90 color quality. White, red, blue, UV, and adjustable RGB modes make it an excellent multi-purpose light for underwater video, macro, night diving, and creative photography.

It also offers a 6,000-lumen burst mode, USB-C charging, remote-control capability, and approximately 60 minutes of runtime at full continuous power.

• 4,000-lumen continuous flood output
• 6,000-lumen burst mode
• Wide 100° underwater beam
• CRI 90 for accurate color reproduction
• 5000K white-light color temperature
• White, Red, UV, Blue & adjustable RGB modes
• Approximately 60-minute runtime at full power
• Three-button control system with battery-level indicator
• USB-C charging
• Compact 62mm x 147mm body
• Remote-control capable
• Both 1-inch ball and YS mounts included
• 330 ft / 100 m depth rating
• Useful for wide-angle video, macro, night diving, and creative lighting

Compact, Versatile Lighting for Underwater Photo & Video

The Kraken Sports Hydra 4000 WRGBU combines a powerful 4,000-lumen continuous video light with multiple color modes, high-quality white light, USB-C charging, and an additional 6,000-lumen burst mode.

Its combination of power and versatility makes it particularly useful for underwater photographers who don't want to carry several specialized lights.

Use the white flood for conventional underwater video, red light during night dives, UV for fluorescence applications, or the adjustable RGB modes for more creative lighting.

4,000 Lumens of Continuous Output

The Hydra 4000 produces 4,000 lumens of continuous white flood lighting at 5000K.

This provides plenty of usable illumination for compact and mirrorless underwater camera systems, particularly when shooting subjects at the close distances where underwater video lights perform best.

It's a strong option for:

• Reef and marine-life video
• Fish portraits
• Close-focus wide angle
• Macro video
• Action-camera systems
• Compact camera systems
• Night diving
• Creative underwater photography

For photographers wanting broader and more balanced wide-angle coverage, two Hydra 4000 lights can be mounted on opposite sides of the housing.

Wide 100° Underwater Beam

Raw lumen output only tells part of the story with an underwater video light.

The Hydra 4000 distributes its output across a 100° underwater beam, giving photographers broad illumination without concentrating all of the available light into a narrow center spot.

This is particularly important for video, where obvious hot spots and uneven illumination can become distracting.

Unlike some multifunction dive lights, the Hydra 4000 does not have a dedicated narrow spot mode. It's designed primarily around broad underwater illumination.

CRI 90 for Better Underwater Color

The Hydra 4000 isn't designed around lumens alone.

Its white light has a CRI of 90, helping cameras reproduce colors more naturally than lower-quality LEDs.

That's particularly important underwater because water rapidly absorbs warm wavelengths such as reds and oranges. By bringing quality artificial light close to your subject, the Hydra can help restore the colors, contrast, and detail that disappear as you descend.

Mozaik Tip: When comparing underwater video lights, don't look at lumens alone. Beam angle, color temperature, and CRI are also important. A powerful light with poor color quality or an uneven beam isn't necessarily the better video light.

White, Red, Blue, UV & RGB Modes

One of the biggest advantages of the Hydra 4000 is its WRGBU multi-color lighting system.

Instead of being limited to conventional white video lighting, you can select different modes depending on what you're shooting.

White Flood
Your primary mode for underwater video and general photography.

Red Light
Useful for night diving and observing certain nocturnal marine life.

Blue & RGB Lighting
Provides additional options for creative underwater photography and video.

UV Light
Designed for fluorescence applications when paired with the appropriate barrier filter.

Kraken specifies LED outputs of 12W red, 9W green, 9W blue, and 18W UV, with wavelengths of 620nm red, 525nm green, 465nm blue, 380nm UV, and 420nm purple.

6,000-Lumen Burst Mode

In addition to its 4,000-lumen continuous output, the Hydra 4000 can produce a 6,000-lumen burst at 5000K.

This provides additional output for suitable underwater still-photography applications.

It's important to understand that an LED burst light is not identical to a traditional xenon underwater strobe. Dedicated strobes produce an extremely short flash duration that is particularly effective for freezing fast-moving subjects.

The Hydra's burst capability is better viewed as an additional photographic tool rather than a complete replacement for a dedicated underwater strobe.

Approximately 60 Minutes at Full Power

Kraken rates the Hydra 4000 for approximately 60 minutes of burn time at 100% continuous flood output.

For many dives, you won't need the light operating at maximum output continuously. Reducing output when subjects are closer can extend useful battery life while also making it easier to balance artificial lighting against ambient light.

Three-Button Underwater Controls

The Hydra 4000 uses a three-button control interface with battery-level indication.

The three-button layout was an update from Kraken's earlier dual-button Hydra design and was intended to make navigating the light's numerous functions easier underwater.

That's especially helpful on a WRGBU light because you're controlling considerably more than simple brightness.

USB-C Charging

The Hydra 4000 introduced convenient USB-C charging to the Hydra platform.

Kraken supplied the light with a compact GaN charger capable of charging up to two batteries simultaneously, with an additional charging port available for another device.

That can help reduce the number of chargers required when traveling with cameras, lights, phones, tablets, and other electronics.

Important: Kraken specifically instructs users to charge the Hydra 4000 battery using the appropriate included charging block.

Remote-Control Capable

Like other lights in Kraken's Hydra family, the Hydra 4000 is remote-control capable.

Adding the compatible Kraken remote and fiber-optic cables allows the light to be controlled without reaching out to the light head itself.

This becomes particularly useful with dual-light configurations where the lights may be positioned farther away from the housing.

Ball and YS Mounts Included

Kraken includes both ball and YS mounting options, making the Hydra 4000 easier to integrate into different underwater camera rigs without immediately purchasing another mounting adapter.

The ball mount works particularly well with conventional 1-inch ball-and-clamp arm systems, while the YS option provides compatibility with YS-style lighting mounts.

Built for Serious Diving

The Hydra 4000 is depth rated to 330 ft / 100 m, substantially deeper than normal recreational scuba limits.

Kraken also designed the light head with an additional level of protection in the event of an accidental battery-compartment flood. The manufacturer states that the head is water resistant if the light is removed from the water immediately following a flood.

Who Is the Hydra 4000 Best For?

The Hydra 4000 WRGBU is particularly well suited for:

• Underwater videographers
• Compact and mirrorless camera systems
• GoPro and action-camera rigs
• Macro photo and video
• Close-focus wide-angle
• Reef and marine-life video
• Night diving
• Fluorescence photography
• Creative RGB lighting
• Divers wanting one light with multiple functions
• Photographers building a dual-video-light system

Its combination of 4,000-lumen continuous output, 6,000-lumen burst, CRI 90 white light, RGB, UV, and red modes makes it much more versatile than a conventional white-only video light.

Technical Specifications

Brand: Kraken Sports
Model: Hydra 4000 WRGBU
SKU: Hydra-4000WRGBU
Continuous Output: 4,000 lumens
Burst Output: 6,000 lumens
White Color Temperature: 5000K
CRI: 90
Underwater Beam Angle: 100°
Runtime: Approx. 60 minutes at 100% flood
Modes: Flood / Red / UV / Blue / Adjustable RGB
Red Output: 12W / 620nm
Green Output: 9W / 525nm
Blue Output: 9W / 465nm
UV Output: 18W / 380nm
Purple Wavelength: 420nm
Controls: 3-button interface with battery-level indicator
Charging: USB-C
Remote Control: Compatible
Mounting: Ball and YS mounts included
Depth Rating: 330 ft / 100 m
Dimensions: 62mm diameter x 147mm length
Weight on Land: Approx. 690g
Weight Underwater: Approx. 290g
Spot Mode: No

Top Features

1. 4,000-Lumen Continuous Flood
Strong continuous illumination for underwater video, macro, reefs, and marine life.

2. High CRI 90 Output
Quality 5000K white light helps reproduce more natural colors underwater.

3. WRGBU Multi-Color Lighting
White, red, blue, UV, and adjustable RGB modes provide significantly more versatility than a standard video light.

4. 6,000-Lumen Burst Mode
Provides additional output for suitable underwater still-photography applications.

5. 100° Wide Underwater Beam
Broad flood coverage is designed for smooth underwater photo and video illumination.