| Light output | About 1,000–3,000 lumens for close-up work; 3,000–6,000 lumens for general video; higher output for wide scenes or strong ambient light. | Compare output at the intended beam angle. A wider beam spreads light over a larger area and may look less bright on the subject. | Macro subjects generally need less output than wide-angle reefs, wrecks, or night scenes. |
| Battery runtime | Around 1–2 hours at full power is a practical starting point; runtime is typically longer at reduced settings. | Check the manufacturer's runtime figures at each brightness level, charging time, battery replacement options, and whether output dims as charge falls. | Choose enough capacity for the planned shooting time, with reserve for delays or a second dive. |
| Beam angle | Approximately 60°–120° is common for video lights; wider beams can provide more even coverage for wide-angle footage. | Look for smooth, even illumination and minimal hotspotting. Consider the camera lens's field of view and whether a diffuser is available. | A broad, even beam is useful for video; a narrower beam can concentrate light on small subjects. |
| Color temperature | Many underwater video lights are in the 5,000–6,500 K range. | A consistent color temperature across paired lights can help keep footage more uniform. Check color-rendering information if accurate color is important. | Useful for restoring color lost with depth, especially in close-range video. |
| Mounting system | A ball mount is common on camera arms; tray clamps and handle mounts are also widely used. | Confirm the light's mount matches the tray or arm, and check that the setup can be tightened and adjusted with gloved hands. | Flexible arms help position lights to reduce backscatter; secure mounts matter in currents and during entry or exit. |
| Depth rating | Select a stated depth rating that exceeds the deepest planned dive, with an appropriate safety margin. | Verify the rating in the product documentation. Inspect seals and O-rings, and follow the maker's instructions for cleaning and maintenance. | A suitable rating and well-maintained seals help protect the light from water ingress. |
| Construction and controls | Look for corrosion-resistant materials, secure port protection, and controls that are easy to operate underwater. | Check for a durable housing, protected charging connections, clear battery indicators, and straightforward brightness controls. | Reliable handling and corrosion resistance are valuable for frequent saltwater use. |
| Travel weight and handling | Compare the complete rig weight, including batteries, arms, clamps, and tray. | A compact setup is easier to pack and handle, while larger lights may offer more output or longer runtime. | Important for air travel, shore entries, and divers who prioritize a lightweight camera rig. |