10 Best Black Light Flashlights 2025 in the United States

The Streamlight 66149 Stylus Pro is a compact UV penlight designed for those who need a reliable black light source. It emits UV light at 400nm wavelength, which is effective for many common uses like detecting stains, pet urine, or counterfeit money. Its UV output of 325 milliwatts provides a decent brightness without being too harsh. The flashlight is powered by a rechargeable lithium-ion battery that fully charges in about 2.5 hours using the included USB cord, making it convenient and cost-effective by eliminating the need to frequently buy disposable batteries.

You can expect around 2 to 2.5 hours of continuous UV light per charge, which is reasonable for short tasks but might require recharging for extended use. The aluminum body feels durable and sturdy, with a water-resistant sliding metal sleeve that protects the USB port, adding to its durability for everyday or outdoor use. Its slim, penlight shape and light weight under 4 ounces make it very portable and easy to carry in a pocket or holster.

It does not come with standalone lithium batteries to swap out, so you’re dependent on recharging it. While the UV output is stable due to regulated output, the runtime is moderate compared to some models with longer battery life. This flashlight suits professionals or hobbyists who need a dependable, rechargeable black light in a compact form, but those needing longer continuous use without recharging might want to consider alternatives.

The Vansky UV Flashlight Black Light is a versatile and useful tool for detecting invisible stains, pet urine, and various other substances. With a wavelength of 395nm, it effectively reveals hidden stains on rugs, carpets, and clothes.

The light output comes from 51 UV LEDs, ensuring a bright and comprehensive coverage, which is particularly useful for inspecting wider areas or finding scorpions and minerals outdoors. However, it's important to note that it's powered by 3 AA batteries, which are not included in the package. This could be seen as a minor inconvenience since you will need to purchase the batteries separately.

The flashlight is made of durable aluminum, giving it a robust build quality that can withstand regular use. Despite its sturdy construction, it remains lightweight and portable, weighing only 1.76 ounces and featuring a compact design that fits easily in your pocket. This makes it convenient for carrying around for tasks like hotel cleanliness inspections or detecting pet urine in your car.

With a lifespan of 15 years for the LEDs, this flashlight is built to last. It also offers a range of versatile uses beyond pet urine detection, such as authenticating currency, curing UV resin, and even identifying unwanted substances in cosmetics. However, its reliance on batteries could mean frequent replacements if used extensively. The product also comes with a 1-year manufacturer's warranty, adding an extra layer of assurance. If you're looking for a durable and versatile UV flashlight with good light output and portability, the Vansky UV Flashlight Black Light is a solid choice.

The uvBeast New V3 365nm Mini flashlight is designed for users who need a compact yet powerful UV light source. With a 365nm wavelength, it offers high-definition ultraviolet light that is ideal for professional and commercial use, minimizing visible light contamination and providing superior results. This flashlight uses an upgraded 5-core UV LED from the larger uvBeast V3 model, ensuring strong UV output and a wide beam.

The device is user-friendly, featuring a simple charging mechanism that requires no disassembly and a double-click switch to prevent accidental activation, enhancing convenience and safety. The flashlight is powered by a lithium-ion battery, included in the package, offering up to 5 hours of runtime, which is adequate for most tasks. The build quality is robust, with an anodized aluminum body that is both durable and lightweight, weighing only 3.17 ounces.

Its small size (2.02 x 0.64 x 0.64 inches) makes it highly portable, fitting easily into a pocket, making it suitable for on-the-go use. However, some users might find the double-click activation feature slightly cumbersome until they get used to it. Additionally, although the battery life is decent, heavy users might prefer a longer-lasting option. This flashlight is best suited for professionals requiring reliable UV light in a portable format, such as those in inspection, forensic analysis, or outdoor activities that benefit from UV illumination.