The Milwaukee 2163-21 REDLITHIUM USB 600-Lumen Hard Hat Headlamp is a rechargeable hard hat headlamp built for hands-free jobsite lighting. This is a headlamp designed for task lighting, inspection work, and low-light jobsite visibility. Model Number 2163-21. If you work in electrical, service, maintenance, or general construction and need light exactly where you are looking, this setup makes a lot of sense.

Output is the real story here. You get 600 lumens of TRUEVIEW high-definition output and 5 output modes: hybrid at 600 lumens for 5 hours, flood high at 400 lumens for 9 hours, flood low at 100 lumens for 20 hours, spot high at 400 lumens for 9 hours, and spot low at 100 lumens for 20 hours. That gives you a wide beam for close work, a focused beam for looking deeper into a space, and lower-output options when runtime matters more than max brightness.

Milwaukee also did the practical stuff right. The light head offers 180 degrees of mobility, so you can aim the beam where you need it instead of fighting the bracket angle. The headlamp is also detachable, which matters more than it sounds. You can pop it off for charging or use it for close-up tasks in places where wearing the whole hard hat setup is awkward.

For jobsite durability, the Milwaukee 2163-21 REDLITHIUM USB 600-Lumen Hard Hat Headlamp is rated IP54 for dust and water resistance and is built to survive 6-foot drops. That makes it a better fit for real trade use than a basic consumer headlamp. It is also compact and light, with a listed weight of 0.33 lb, which helps when you are wearing it for a full shift.

Power comes from the included REDLITHIUM USB 3.0Ah battery. The battery can be charged in the light through USB-C, and Milwaukee states you can get 50% charge in under 30 minutes, 80% in under 1 hour, and a full charge in 2 hours. There is also a battery status indicator button, so you are not guessing when it is time to charge. If you already run other Milwaukee REDLITHIUM USB lighting, the swappable battery setup is a real advantage because you can keep working instead of waiting on a cord.

Attachment is handled with 4 hard hat clips and a rubber grip for a secure fit. That makes this a better choice for workers who need a hard hat-compatible lighting solution rather than just a standard elastic-strap headlamp. It is especially useful for electricians, utility techs, inspectors, plant maintenance crews, and general contractors working in mechanical rooms, attics, crawl spaces, service panels, and unfinished interiors.

If you need a cordless work light that stays on your hard hat, gives you multiple beam options, and charges quickly between tasks, this one checks the right boxes. It is not trying to be a floodlight for lighting an entire room. It is a compact Milwaukee headlamp for seeing the exact area in front of you and keeping both hands free while you work.

Milwaukee 2163-21 REDLITHIUM USB 600-Lumen Hard Hat Headlamp Gets the Important Stuff Right

This is the kind of rechargeable headlamp that earns its keep fast if you wear a hard hat and work in dark mechanical, electrical, or service spaces.

• Who it's for: Electricians, maintenance techs, inspectors, and contractors who need a true hard hat headlamp instead of a basic camping light.
• Why it stands out: The mix of 600-lumen output, swappable REDLITHIUM USB battery, USB-C charging, and detachable light body makes it more practical on the job than most compact headlamps.
• Worth knowing: This is built for focused task lighting and all-day wear, not for lighting an entire room like a large area light.

• Is this headlamp rechargeable? Yes. It uses a Milwaukee REDLITHIUM USB 3.0Ah battery and charges through USB-C.
• How many lighting modes does it have? It has 5 output modes: hybrid, flood high, flood low, spot high, and spot low.
• Is it rated for dust and water exposure? Yes. The light is rated IP54 for dust and water resistance.
• Can the light be removed from the hard hat mount? Yes. The headlamp is detachable, which makes charging and close-up task use easier.