SEAC I25 Underwater Dive Torch 1000 Lumen 10W Compact Black

Lumens measure the total light output, but they say nothing about how that light is shaped, so a tight narrow beam can look far brighter at distance than a higher-lumen wide beam. Beam angle, color temperature, and water clarity affect what you actually see as much as the lumen figure does. Use lumens to compare lights of a similar beam type rather than as a single score of quality.

A primary light is your main light, usually brighter, larger, and with a longer burn time, while a backup is a small, simple light carried in case the primary fails. Any dive where you need a light to exit safely, such as a night dive, calls for carrying at least one backup. Backups are chosen for reliability and simplicity rather than for maximum output.

Burn time and brightness trade directly against each other, so the same battery run at a lower power setting lasts substantially longer. Manufacturers usually quote burn time at each power level, and many lights automatically step down output as the battery drains or the head heats up. Treat quoted figures as fresh-battery, ideal-condition numbers and plan for more burn time than your dive actually needs.

The o-rings sealing the battery compartment are what keep the light from flooding, so inspect them for grit, hair, and nicks every time you open it, and wipe the sealing surfaces clean. Lubricate lightly with the grease type the manufacturer specifies, using a thin film rather than a heavy coat, because excess grease attracts sand. Replace o-rings when they look flattened, cracked, or dry, and do not over-tighten the cap in the hope of sealing a bad o-ring.

Lithium batteries are subject to airline and regulatory limits that vary by cell chemistry, watt-hour rating, and whether the cells are installed or loose. As a general rule lithium cells travel in carry-on baggage rather than checked baggage, with terminals protected against short circuit, but you must confirm your airline's current policy and any local rules before you fly. Carrying the manufacturer's battery specification sheet helps if you are questioned at screening.

Rinse it in fresh water after each dive day and work the switch while it is submerged so salt does not crystallize inside it, then dry it before opening. For storage, remove or charge the batteries as the manual directs, and leave the cap loose so the o-ring does not take a permanent set. Never store a light with corroded or leaking cells inside it.

Test it briefly as part of your pre-dive check, but do not leave a powerful light running in air, because many are designed to shed heat into the water and can overheat on the surface. Check the manual, as some lights have thermal protection that dims or shuts them down when they are dry. Testing before you gear up is far better than discovering a dead light at depth.

The i25 runs up to 2 hours at maximum power and up to 3 hours in reduced output mode on its included 3450 mAh Li-Ion battery. As with any light, the lower setting stretches burn time considerably, so plan a dive that needs continuous light around the 2 hour figure and treat the reduced mode as your reserve for longer or multi-dive days.

It works as either. With 10 W and roughly 1000 lumens in a 6 degree beam, the i25 serves as a primary light for recreational diving and underwater photography, where the tight spot helps pick out subjects at distance. Its 155 gram weight and 130 mm length also make it a practical secondary or backup light clipped to a technical or deep setup.

The i25 is rated to a maximum depth of 100 meters, which covers recreational limits and deeper technical profiles. The switch includes an anti-accidental activation lock, so the torch stays off during transit and descent until you choose to turn it on. Rinse it in fresh water after each dive day to keep the switch and seals free of salt.

Yes. The i25 ships with its 3450 mAh Li-Ion rechargeable battery already included and ready to use, plus a USB charging cable and adapter so you can charge from a standard USB source. A protective carrying case is also supplied for travel and storage, so the torch is complete out of the box.