SUBNOX SUB10 KEF 10,000 Lumen Professional Wide-Angle Video Light with Ambient Light Modes
Anyone who has ever tried to take underwater videos will be aware that water absorbs the colour from the visible light spectrum effectively removing the colour from our images and that this problem gets worse the deeper you go. White Balancing your camera and adding a red filter can help to restore natural colours but it can result in excessively noisy and dark images at depth. Illuminating your subjects with underwater video lights causes a different problem as subjects appear overly red as they swim into the path of the light.
Professional Underwater Cinematographer Kay Burn Lim, founder of SUBNOX, has created the SUB10KEF, 10,000 Lumen wide-angle video light to resolve this problem. 
The nexus of this innovative new design is the specially designed light head which produces three different light outputs. The standard white light has a CRI of 93, colour temperature of 5600K, equivalent to daylight. The real innovation is in the other two "Ambient Light" modes, the first is a blue light equivalent to ambient light found at 6-13 meters deep and the second is equivalent to 13-20 meters deep.
Previously this problem has been solved by the addition of Ambient light filters as pioneered by Keldan and also used by Weefine. These work really well individually but the filters have to be swapped over at different depths and reduce the intensity of the light significantly. 
By using built-in ambient lights, optimised for different depths, the SUBNOX SUB10KEF provides ambient water colour illumination at up to 2.5 times the brightness of an equivalent powered light combined with a blue filter. Plus instead of having cumbersome filters to swap out as you descend and then ascend again all it takes is a quick rotation of a dial to switch between the two recommended light for each of the two depth ranges.
For those not diving in tropical blue waters, SUBNOX has come up with two alternative light heads which can be purchased seperately from the main light. Designed for green water and greenish-blue water. 
With an ergonomic 11-step magnetic power control ring situated at the rear of the light and a rear-mounted LED display for the brightness level and remaining burn time it is easy to control and manage your light source. The 72Wh battery can be charged from 0-80% in as little as two hours and is air-travel safe. 
Specifications
- Lumens (5600K LED): 10,000
- Beam Angle: 128 degrees underwater
- CRI (5600K LED): 93Ra
- Ambient Water Colours Built in: Ambient Blue 6–13m, Ambient Blue 12–20m
- Power Control: Magnetic Switch Ring
- Battery: USB-C Charging, 14.4V, 5000mAh, 72Wh
- Dimensions: 183mm × 74mm
- Weight (On Land with Battery): 813g
- Underwater Weight (Without Mounting Bracket): 294g (seawater)
Traditionally, videographers balance artificial light and the blue ambient water by adding blue filters — which restore natural background tone but reduce light output. SUBNOX's SUB10KEF’s patent-pending light head produces tuned ambient-blue outputs from the LED itself, delivering higher effective brightness while keeping a natural balance between subject and background. That’s particularly helpful for wide-angle work and mixed-depth daytime filming. At Lightbalance we think this marks a revolution in Underwater Imaging.
