Can You See Fleas With A Black Light? {Does it Really Work?}

Have you ever wondered if you can see flea and ticks with a black light?

Instead of getting bitten, wouldn’t it be nice to see them before you try to get a good night’s sleep?

Can You See Fleas With A Black Light? We will reveal all below.

Can You See Fleas With A Black Light?

Yes, you can see fleas with a black light because their bodies absorb the light which makes them easier to see.  If the lighting is poor, you will easily be able to see the fleas with a black light.

If you have an infestation they will be very easy to see, especially on furniture with fabric on them such as beds, sofas and carpets.

If you do find fleas you should spray the affected area with flea spray available on amazon to kill them and to stop them spreading.

Can You See Fleas With A Black Light

Do Fleas Glow Under UV Light?

No they are tiny and cannot be seen. This is not good when it comes to dosing off to sleep, waking up the next morning with small little itchy bites that will keep you up scratching.

That’s why you should use a light source like UV light before you snuggle up for some zzz’s, as this will give you the ability to see if you have any fleas on your seemingly cozy abode.

Fleas will glow under UV light thanks to properties in their skin, which absorb and reflex the light. Using UV light is a good way to spot their presence so you don’t take any chances.

You can also use UV light to check your pets such as cats, dogs, rabbits and so on. Make sure to also check for eggs which you will also be able to see.

Still, identifying them and knowing that they are there is only one part of the problem, calling for some way to get rid of them so they don’t bite.

Fleas do not like natural light, which could make them harder to find during the day. Instead, you should:

  1. Turn off the lights.
  2. Turn on a UV light.
  3. Search around corners, under blankets, and on mattresses to see if you find signs of fleas.

Once you see them glowing, that’s an indicator that you should take steps to get rid of them, using one of many tactics. We’ll share a few of those below along with a trick you can do with lighting.

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Are Fleas Attracted to Light?

Although fleas are nocturnal creatures, they are indeed attracted to light. Fleas are active during the night, but when they are searching for food, light and heat attracts them.

Studies have shown that fleas move to lighted areas in the span of 30 to 40 minutes when a light source is placed in a dark area. Light also gives off heat and this is another reason why fleas are attracted to it.

Using light as an effective technique to attract and trap fleas has been proven to work and you should give it a try as well.

If you do find fleas you should spray the affected area with flea spray available on amazon to kill them and to stop them spreading.

Can You Use A Black Light To See Fleas?

Yes. You should be able to see it fleas under a black light. Fleas, however, will not be able to see because they are blind. Fleas are highly sensitive to light sources including UV light.

You will have to pay close attention because fleas are tiny, but you will not need a magnifying glass. Look closely at tiny wingless creatures that look reddish brown to black in color.

The UV-light should be able to make fleas highly visible because their bodies absorb it. When the light surrounding the area is dim, the use of UV light shining in the area where you suspect fleas will make them more visible.

Are Fleas Attracted to Phone Light?

Fleas like green-yellow light at 500-530 nm. They are not attracted to red light above 600 nm. Fleas make consider the light on your flashlight casting a shadow against an object to be potential prey. They may decide to jump on your phone to inspect the area for a host.

The carbon dioxide that you breathe out while turning on your phone’s light may help to attract fleas to it. Another technique is to flicker your phone’s flashlight on and off to create or mimic movement.

Fleas are sensitive to lights turning on and off and the heat that results from it. A phone flashlight is not the best method of attracting please.

Are Fleas Attracted to UV Light?

Just like many other creepy crawlers, these tiny jumping insects have an affinity for UV light, flocking toward it when they see it.

That’s the reason why many bug zappers have feature glowing UV light, used as a way to attract all kinds of insects and zap them so they aren’t swarming around you anymore.

Adding a UV light outside of your bed, tent, or sleeping bag could be a way to prevent fleas from hopping over to you and your sleeping area while you nap.

If you’re in a place where fleas are prevalent and are trying to find an effective way to get and keep them away, UV light could be the way to go. Keep in mind that fleas will only flock to UV light if they:

  • Have a sufficient amount of food
  • Are not in favorable conditions
  • Are close enough to UV light to be able to sense and see it

Does UV Light Kill Fleas, Is It Effecting?

UV light does attract fleas, but does it kill them? The answer is yes, but it takes a very long time. UV light has radiation, something that affects cells of all living things.

With continued exposure, it can start to manipulate and mutate cells, killing them or turning them into cancer-causing cells.

While that sounds like something that could kill pretty fast, this entire process happens over a long period of time, something that you don’t want with bugs.

Plus, fleas can feel the effects of UV lights and will start to move away and out when they feel it taking effect. Instead of using UV light to kill fleas, you should consider:

  • A powerful vacuum
  • A steam cleaner with really hot steam
  • A washing machine with lots of bleach
  • Chemicals that will wipe out fleas and other tiny insects.

Do Fleas Like Light or Darkness?

Due to fleas’ genetic makeup, they cannot see red light. What they can see however is yellow light, something that they are mostly attracted to. Fleas do like yellow light but they also light darkness, so long as it’s quick.

When exposed to light and switching lights off quickly, these little jumping insects think it’s a shadow and await their next feast.

When observing fleas in different lighting conditions, researchers found that fleas will move around from place to place depending on the circumstances.

They do like to be exposed to light and will gravitate toward it if they are in a dark place. However, not just any light will do, with many fleas very sensitive to sunlight.

Due to their affinity for light, you could set up a small contraption to get rid of them quickly using just a light bulb and a small shallow pan of water.

To execute, simply:

  • Turn on the light bulb
  • Fill the pan with water
  • String the light bulb above the water
  • The fleas will jump in the water to get to the light and eventually drown.


Knowing if fleas are attracted to light can help you get rid of them, avoiding getting bitten, and sleeping soundly wherever you may roam. Shine some light and see where they are to protect your space.

Thanks for visiting for the best information to help you to make the pest control process easy, safe & affordable.

Jason Barrett

Hello, I'm Jason. I have 11 years of experience in dealing with pests. I try to provide you the best information that'll help you to make the pest control process easy & affordable