Artificial light is bad for animals because it disrupts their natural behaviors like migration, mating, foraging, and sleep, leading to stress, disorientation, increased predation, habitat loss, and even death, affecting nocturnal species, migrating birds, sea turtles, and insects by altering their circadian rhythms and exposing them to danger.
Light pollution, or artificial light at night, is the excessive or poor use of artificial outdoor light, and it disrupts the natural patterns of wildlife, contributes to the increase in carbon dioxide (CO2) in the atmosphere, disrupts human sleep, and obscures the stars in the night sky.
Native mammals, birds, frogs and reptiles are negatively impacted by artificial light at night. Sadly, while LED lights can be energy efficient, their ultra bright white and blue tones make matters worse.
Exposure to light at night while awake, such as in shift work, may be associated with an increased risk of breast cancer and also cause sleep, gastrointestinal, mood and cardiovascular disorders. However, these effects are due disruption of the natural circadian rhythm, regardless of the type of illumination. More...
The presence of light allows animals to see and differentiate between various colors, which is crucial for their survival, such as finding food or avoiding predators. 3. **Effect 2 - Photoperiodic Biological Rhythms**: Many animals rely on light to regulate their biological rhythms.
Scientific evidence suggests that artificial light at night has negative and deadly effects on many creatures, including amphibians, birds, mammals, insects, and plants.
Do cats need a light on at night? No, cats do not need a light on at night because they can see well in low-light settings. In fact, bright lights can disrupt their sleep-wake cycle. Harsh lighting suppresses melatonin production and causes them to be more active at night.
Light pollution tends to be most acute in urban environments, have pronounced ecological effects, and potentially influence human circadian rhythms. Light pollution also disrupts ecosystems, wastes energy, increases impacts of climate change and can have adverse health effects in humans.
DALLAS, Nov. 3, 2025 — Higher levels of artificial light at night were linked to increased stress-related activity in the brain, inflamed arteries and a higher risk of heart disease, according to a preliminary study to be presented at the American Heart Association's Scientific Sessions 2025.
By altering the light environment experienced by nocturnal insects, ALAN can disrupt their temporal patterns, interfere with their spatial orientation, act as a fatal attraction, reduce their visual sensitivity, and alter foraging activity and species interactions.
Indoor LED lighting is an excellent choice for homes with pets. Ideally, you'll want to choose dimmable fixtures so you can adjust the light level to make it as close to natural light as possible.
Blue: The calming and soothing properties of blue can help alleviate anxiety and promote a sense of tranquility for dogs. Green: Representing balance and harmony, green can help reduce stress and create a serene environment for dogs to unwind.
The Problem with Most LEDs
Standard LEDs often emit a narrow or overly “cold” light (high in blue tones), which may feel unnatural for birds. Birds thrive with a broad-spectrum visible light that mimics daylight — without the artificial addition of UVB, which some LEDs use.
A UV lamp that emits ultraviolet radiation similar to sunlight and thus produces vitamin D3 in the skin is an excellent alternative for CF, and SBS patients who suffer from vitamin D deficiency due to fat malabsorption, especially during the winter months when natural sunlight is unable to produce vitamin D3 in the ...
LED (Light Emitting Diode) bulbs are the most energy efficient lighting option available, and can therefore save you the most money on your electricity bills. They produce 40-80 lumens per watt, and offer several other benefits, including longevity and brightness.
Sensitivity to Light
Throughout history, sudden bursts of light have signaled danger, triggering instinctual fear responses aimed at self-preservation. Additionally, nocturnal animals, with their highly sensitive eyes adapted for low-light conditions, find the sudden brightness of flashlights overwhelming.
8 Bad Habits That Are Killing Your Brain Cells
Disrupt chemical signaling: Exposure to light after dark can suppress the body's production of melatonin, a key hormone that signals it's time to sleep. Shift sleep/wake cycles: Artificial light can confuse our internal clocks, potentially leading to sleep disturbances.
About 75% of your brain is water, making hydration crucial for cognitive functions like memory, focus, and reaction time, as even mild dehydration can impair these abilities; the rest is primarily fat and other tissues, with water essential for creating hormones and neurotransmitters.
Exposure to artificial bright light during the nighttime suppresses melatonin secretion, increases sleep onset latency (SOL) and increases alertness. Circadian misalignment caused by chronic ALAN exposure may have negative effects on the psychological, cardiovascular and/or metabolic functions.
LED light disadvantages include higher upfront cost, potential health impacts from blue light and flicker (causing eye strain, headaches, sleep disruption), dimming incompatibility, directional light limitations, temperature sensitivity, and sometimes poor color rendering or buzzing, though many of these issues are being addressed with quality improvements.
The type and strength of the artificial light you choose will also impact the number of hours that will be necessary. For most plants getting some natural light, 12 to 14 hours of artificial light should do but plants can need over 16 hours of supplemental light if there is little natural light.
The top "silent killers" in cats are Chronic Kidney Disease (CKD), often progressing until 75% kidney failure, and Hypertrophic Cardiomyopathy (HCM), a heart muscle disease, both often showing few symptoms until advanced stages, along with Hypertension (High Blood Pressure) and Hepatic Lipidosis (Fatty Liver), leading to sudden illness or organ failure if undetected. Early detection through regular vet check-ups, blood tests, and monitoring for subtle changes like increased thirst/urination, weight loss, or hiding is crucial for managing these common, often hidden, feline diseases, says this article.
New Cat? Set Realistic Expectations! You can expect that it will take your cat some time to get used to the new routines and environment. The 'Rule of Three' means that you can gauge the time it might take for your cat to fully acclimate to his home in threes: three days, three weeks, and three months.
Speaking of cat sleep patterns, it's important to have enough light in your home to keep you and your cat safe. Cats' eyes can naturally adapt to low-light conditions, but leaving a light on can help a cat feel comforted in the middle of the night. It can also prevent accidents from happening in complete darkness.