Best Black Light for Finding Cat Urine – 3 Powerful Options

Last Updated on December 22, 2021 by Jenny

Black Light for cat urine
Finding Cat Urine so you can clean is a much easier job using a UV Black Light.

Cat Urine Black Light

Many a cat owner will know how it feels when you can smell cat urine in your home, but you can’t see it. It dries clear but leaves a scent, which is why you’ll want the best black light to find cat urine so that you can properly clean it and keep your home smelling fresh. Please note that this article may contain affiliate links. That means that if you buy something, I may earn a small commission. You can read my full disclosure at the bottom of the page.

Can you see cat urine with a black light?

Yes – cat urine will normally show up as a slight yellow or green glow in a dark room when a UV black light urine detector is shone on it. It’s best to wait until the evening to check, as darkness helps make the UV light more effective. Close the drapes, switch off the light and do a sweep of the room, including the floor, furniture, and walls. It’s a good idea to carry something with you like tape or chalk to mark the stain. That way, when you switch the lights back on, you’ll still know where you need to clean.

Yes – cat urine will normally show up as a slight yellow or green glow in a dark room when a UV black light is shone on it. Find the best Black Light here. Click To Tweet

Does cat vomit show under black light?

While urine will give a strong glow under a UV blacklight, it’s not as simple with vomit. Cat saliva can glow when a UV light is shone onto it, but vomit is usually a mix of saliva and other stomach contents, usually materials that don’t glow. You might see trace patches of glowing when you scan cat vomit with a UV black light, but it may not show up at all due to the weakness of the saliva in the mix.

Do all black lights detect urine?

Not every black light is optimized for cat urine. You need to check the wavelength of the UV light emitted. Some black lights use LEDs with a wavelength of 390nm or 400nm, which you should avoid. The wavelengths that are best for a pet urine detector lie between 365nm and 385nm.

The best blacklights for cat urine

Here are three options for black lights that will help you detect any stains and get them cleaned up quickly. Some are better than others, but this is a good range to suit any budget.

1. LETMY High Powered Black Light

Best Black Light for Finding Cat Urine High-Powered Black Light UV Flashlight, LETMY Powerful Professional Blacklight Flashlights for Pet Urine Detection
The Letaiy High Powered UF Flashlight for finding cat urine.

Buy it on Amazon. If you want to balance price and comfort, this is a good option. It isn’t the strongest or most effective light though, and is best for finding recent urine rather than dried-in stains. Pros:

  • Up to 10 hours of battery life
  • Compact and lightweight – easy to use around the home


  • 395NM wavelength – not the best range for cat urine
  • 51 LEDs – more powerful than basic models but better options available

Purchase one on Amazon.

2. Alonefire X901UV UV Flashlight

Best Black Light for Finding Cat Urine Alonefire X901UV UV Flashlight
The Alonefire X901UV Flashlight for finding cat urine.

Buy it on Amazon. The Alonefire is rechargeable and powerful, offering fantastic performance at this price. Most importantly, its 365NM light is extremely effective at spotting urine. Pros:

  • 365NM light source offers effective detection of cat urine
  • Rechargeable battery and safety glasses included


  • Some customers have complained about build quality

Purchase one on Amazon.

Related Reading: Air PurifierStain and Oder RemoversAutomatic Litter Box

3. uvMonster Blacklight Flashlight

Best Black Light for Finding Cat Urine UV Blacklight Flashlight, Super Bright 128 LED Pet Dog Cat Urine Detector light Flashlight for Pet Urine Stains
The UVMonster for finding cat urine.

Buy it on Amazon. Customer reviews are generally very positive about the uvMonster, and with 128 LEDs offering 385-395NM wavelengths they should be. Of those designed for casual use at home, it’s a solid option, although it needs a lot of battery power. Pros:

  • 128 LEDs help to deliver a powerful beam even in lighter rooms
  • 385-395NM wavelength range is more suited to urine than cheaper models


  • Customers have reported inconsistent performance
  • Requires 6 x AA batteries to work

Purchase one on Amazon.

Collage of cats sits and a black light

Cleaning cat urine from the carpet

Once you’ve found a black light that you’re happy with, you’ll then start finding the cat urine…which you’ll need to clean. Cat urine can be stubborn – simply scrubbing with warm water might help to dilute the smell, but it won’t completely clean and disinfect the area. And if you leave a trace, then your cat may revisit the same spot again.

How do you get dried cat urine out of carpet?

There are a number of ways to remove dried-in urine. Some of them involve some products you might already have around your home, while others are dedicated cleaning products that some of you have recommended.

Does vinegar and baking soda remove cat urine from carpet?

If you have vinegar and baking soda, you can mix them to help deodorize the stain and give your carpets or furniture a deeper clean. But only mix them on the site of the stain itself, as it’s not the resulting product but the reaction that does the work. So, sprinkle some baking sofa onto the stain, then ideally spray vinegar over it, or pour a small amount if you don’t have a spray bottle. The fizzing reaction will help loosen the urine stain, and it can then be washed away to clear the smell.

Does hydrogen peroxide get rid of cat urine odor?

If you don’t have any baking soda or vinegar, or it doesn’t quite remove the smell, hydrogen peroxide can work wonders. This antiseptic can be mixed with liquid soap and scrubbed into the carpet to completely neutralize the odor of the urine. Hydrogen peroxide shouldn’t stain your carpet itself but I can’t guarantee anything, so if you’re concerned, test it on a hidden area first. If you do use it, make sure you let it seep into the fibers of your carpet – if it sits on the top of the pile then the odor will return.

Will cat urine smell ever go away?

Cat urine odor will eventually fade a little, but if left untreated it’ll never completely go away. If you have a more humid day then the uric acid in the urine can recrystallize, which will cause the odor to return. It’s best to make sure you use a black light and identify every urine stain, and then clean them thoroughly.

The best products to clean cat urine

As well as these home remedies, I’ve written before on cats peeing outside of the litter box and some of you gave suggestions on the best products to clean cat urine. Fizzion on Amazon, was recommended by Sharon in AZ, while another reader recommended Planet Urine on Amazon as another reliable option for cleaning urine and completely neutralizing any odor.

Other recommendations include Simple Solution Extreme Stain and Odor Remover on Amazon– which you can also buy with a black light or on its own, if you’ve chosen one of the black lights above – while another reader swears by Eco88 on Amazon.

Check that article to see more of what you said about these products.

You could also look at the CritterZone – a natural purifier that helps to remove the odor from the air in your home, so even if the stain isn’t completely cleaned, the pollutants are broken down by the negative and positive ions that CritterZone generates.

Read the article on a natural purifier. Buy the CritterZone air purifier for cat smells on their website and use CritterZone coupon code “floppycats” to get $15 off your purchase. Do you have your own Black Light for Finding Cat Urine that you’d recommend? What do you find works best for preventing urine odors? Let me know your suggestions in the comments below.  

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2 thoughts on “Best Black Light for Finding Cat Urine – 3 Powerful Options

  1. Patti Johnson says:

    WOW! SUPER PAWESOME & FABULOUS POST, Jenny honey! TYSVM for all this great info! I truly learned A LOT! I don’t have a fave black light product (didn’t know much about them for detecting cat urine, etc., prior to reading your amazeballs post today) to recommend as we don’t have a urine issue with Miss PSB yet (and I hope we never do but you never know what could happen as she gets older and older…). She does vomit now and then (cats!) but finding THAT has yet to be a problem. 😉 <3

    Big hugs & lots of love & purrs!

    Patti & Miss Pink Sugarbelle 🙂 <3 <3 <3

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