Hardhat Lighting Clips from 1Hardhats.com

The Hard Hat Safety Lights feature a 1.6 ounce light that attaches to a hard hat. The light can be seen up to one-half mile away and has two light patterns: fast flash or a steady light

Includes 3 AAA batteries and a mounting bracket which uses 3M adhesive
Imprintable

Note:
Cap not included.
Shown for illustrative purposes only.

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VB3™ 2220 LED
Clip on task lighting

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The VB3 2220 LED has dual super bright white LEDs that may never need replacing and provide over 100 hours of battery burn time. Light turns on when the head is flipped up. It also pivots to a full 180° for aiming light where you need it. The built-in clip attaches to surfaces up to 1/2" thick.

2 CR2032 3V Lithium coin cells are included
Available in an attractive matte black finish
Specifications

Note:
Cap not included.
Shown for illustrative purposes only.

Clip on lighting

Fits hard hats and most safety glasses
Average battery life of 40 hours
Ideal for low-light situations
2-bulb light

FingerLight

The FingerLight/Flash light contains a single high powered white LED capable of luminating any subject as far away as 30 ft.

The light is powered by 3 long lasting lithium batteries (AG10) which are included and may be replaced when needed. If the light were left in the on position, the battery life will exceed 40 hrs.

Each Light has a self adhesive (Velcro) strap which will fit around most fingers, pencils, pens, fishing poles or a variety of hand tools.

It's a great product for any work in the dark, including reading, writing, at concerts, fishing (it aluminates the rod's eyelets and monofilament line). It is also great for attaching to a pet's collar for seeing the animal in the dark. FingerLight's uses are only limited by one's imagination.