A headlamp is one of those things everyone should own and about half of people don't, usually making do with holding a torch in their teeth instead.
You're giving the fix to a problem they've worked around so many times they've stopped noticing it, which is often the best kind of practical gift.
The motion sensor lets them switch it on and off with a wave, which matters when hands are covered in grease, paint or whatever the job has produced.
There are 8 light modes including a red warning light, so it covers close work, a wide beam and visibility on a roadside without needing a second torch.
It charges over USB rather than eating batteries, and a full charge gives up to 30 hours depending on mode, which is enough for a camping trip without thinking about it.
You should check whether the band is washable before you buy for someone working in dusty conditions. Headlamp bands absorb sweat and dirt over a season, and a removable one lasts considerably longer than one that can't be cleaned.
At 76 grams with an adjustable band it's light enough to forget you're wearing, which is the thing that decides whether a headlamp gets used or taken off after ten minutes.
It's waterproof too, so rain doesn't stop the job, and it has over 17,000 reviews behind it as a bestseller.
It's brilliant for roof cavities, under cars, camping, night fishing, dog walks and finding the way to the loo at 2am. Charge it before you wrap it so they can try it the same night.
✔ Leaves both hands free instead of holding a torch in your teeth
✔ Motion sensor so you can switch it on with greasy hands
✔ 8 modes including a red warning light
✔ USB rechargeable with up to 30 hours per charge
✔ Just 76 grams and waterproof, with 17,000+ reviews