The comfort and health of our bearded dragon is a top priority for any devoted owner. Providing proper lighting, including at nighttime, is an essential part of caring for these pets. If you’ve been wondering whether a red light is recommended for your bearded dragon’s enclosure after hours, you’ve come to the right place.
The short answer is no – bearded dragons do not need a red light at night. In fact, red lights can disrupt their sleep cycles and circadian rhythms. The ideal setup is to provide a heat source that emits no light at night along with a proper day/night cycle of white light during the day and complete darkness at night.
Bearded Dragons are Diurnal Reptiles
They are awake during the day, sleep at night
Bearded dragons are diurnal reptiles, meaning they are most active during the day. In the wild, bearded dragons bask in the warm sun during the day to raise their body temperature and hunt for food. When the sun goes down, they find shelter and sleep through the night.
Their bodies are programmed to be awake when it’s light out and sleep when it’s dark.
This daily sleep-wake cycle is critical for a bearded dragon’s health and wellbeing. When they are awake during the day, they have the energy and alertness needed to find food, interact with other dragons, and watch for predators.
Sleep at night allows their bodies to repair cells, consolidate memories, and restore energy levels. Disrupting this natural circadian rhythm by keeping lights on at night can cause stress for a bearded dragon.
Red light disrupts night time sleep patterns
While it may seem like a good idea to provide some light for a bearded dragon at night with a red bulb, this can actually disrupt their sleep. Bearded dragons have special photoreceptor cells in their eyes that allow them to see red light.
So a red bulb will illuminate their enclosure and prevent them from having a proper nighttime period of darkness.
Lack of complete darkness at night can prevent bearded dragons from getting deep, restorative sleep. It may also keep them awake and active at times when they should be sleeping. This confused day-night cycle can weaken their immune system, inhibit growth and appetite, and even shorten their lifespan.
For the health and wellbeing of your bearded dragon, it’s best to turn off all lights at night and allow them to sleep peacefully in complete darkness.
Reasons to Avoid Red Lights at Night
Circadian Rhythm Disruption
Exposing bearded dragons to red lights at night can disrupt their circadian rhythms, which are the natural cycles that regulate sleep and activity. Reptiles need darkness at night to produce melatonin, a hormone that induces sleep.
Light exposure at night suppresses melatonin production, making it difficult for them to rest properly (study).
An improper circadian rhythm can cause chronic stress, reduced appetite, slower growth rates, and reproductive issues in bearded dragons. It can also weaken their immune system, increasing susceptibility to disease.
A 2018 study found that disrupting circadian rhythms altered gut microbiota in mice, causing inflammation.
Some owners use red bulbs at night to provide ambient heat, believing the light is invisible to reptiles. However, research shows bearded dragons can see red light. Their eyes contain photoreceptor cells sensitive to a wide spectrum of colors, including red wavelengths up to 702 nm (source).
So red bulbs at night still disrupt their circadian cycles.
Stress and Health Impacts
Exposure to unnatural light cycles induces chronic stress in reptiles. Studies confirm red light at night spikes the stress hormone corticosterone in reptiles, which remains elevated for up to 18 hours (evidence).
High corticosterone suppresses the immune system and causes adverse health effects:
- Increased infections
- Poor wound healing
- Greater tumors/cancers risk
- Organ damage (kidneys, intestines)
Research also links corticosterone to lower fertility, reduced clutches, and offspring defects. Offspring from stressed mothers often have poor fitness, growth problems, and high mortality (source).
| Corticosterone Effects | Consequences |
|---|---|
| Weakened bones | Fractures |
| Altered fat deposits | Obesity |
Ideal Nighttime Heating Options
Ceramic Heat Emitter
A ceramic heat emitter (CHE) is an excellent nighttime heating choice for bearded dragons. CHEs produce heat but do not emit light, making them ideal for use at night when light disrupts a dragon’s circadian rhythm.
CHEs screw into a ceramic lamp fixture and warm your dragon’s enclosure to create a comfortable nighttime temperature gradient. Experts recommend using a CHE along with a reptile thermostat to control temperatures precisely.
Some great benefits of CHEs are that they last a long time, use less electricity than other heating options, and produce no light that might disturb your dragon’s sleep.
Under Tank Heater
An under tank heater (UTH) is another popular nighttime heating choice for bearded dragons. UTHs are placed under one side of the tank to provide localized belly heat. The warmth from below is thought to mimic the warmth dragons would feel from the ground as they sleep at night in the wild.
High-quality UTHs designed specifically for reptiles, combined with a thermostat, allow precise temperature control. Benefits of UTHs include emitting no light at night, using less electricity, and providing the naturalistic belly heat dragons crave.
Just be sure to place the UTH on only one side of the tank so your dragon can thermoregulate by moving on and off the warm spot as needed.
No Light Heat Mat
No light heat mats offer another excellent non-light-emitting nighttime heating option for bearded dragons. These thin, flexible mats come in a range of sizes and can be placed under or alongside your dragon’s enclosure. Heat mats paired with a thermostat allow precise temperature adjustment.
Benefits of no light heat mats are that they create no light disturbance, use very little electricity, come in convenient sizes, and provide belly heat from below or the sides. Just be sure to use them on only part of the tank so your dragon can choose to be on or off the warm section.
Providing Proper Daytime Lighting
White light for daytime hours
Bearded dragons need full spectrum lighting that mimics natural sunlight during the day to regulate their circadian rhythm and remain healthy. The best option is a linear UVB fluorescent or mercury vapor bulb that emits UVA and UVB light along with heat and visible light.
These full spectrum bulbs should be fitted over the basking area to allow the bearded dragon to absorb UVB rays for 12-14 hours per day. Avoid compact fluorescent or coil UVB bulbs as they can cause eye problems in bearded dragons.
Make sure to use a reflector dome fixture to direct the light and heat towards the basking area. Your bearded dragon should never be exposed to light from colored bulbs at night as it can disrupt their sleep-wake cycle.
Heat lamps
In addition to UVB lighting, bearded dragons require supplemental heat from an incandescent basking bulb or ceramic heat emitter during the day. The basking area temperature should be 95-110°F to allow proper digestion and appetite.
Place the heat lamp over one end of the tank and keep a thermometer at basking level to monitor temperatures. Use a dimmer or rheostat to adjust heat output if needed. The cool end of the tank should be kept around 80°F.
Turn off all heat lamps at night and allow the temperature to drop to 65-75°F to mimic the bearded dragon’s natural desert habitat. Providing the proper temperature gradient will allow your bearded dragon to thermoregulate by moving between the warm and cool ends of the tank.
UVB lighting
UVB light is essential for bearded dragons as they cannot produce vitamin D3 on their own without it. Exposure to UVB allows vitamin D3 synthesis for proper calcium metabolism and bone growth. Make sure your UVB bulb is rated for at least 10% UVB output and is positioned no further than 18 inches from where your bearded dragon can bask.
The UVB rays should overlap the basking area for maximum exposure. Replace UVB bulbs every 6 months, even if they appear to be working, as their UV output declines over time. Without adequate vitamin D3, your bearded dragon risks developing metabolic bone disease, which can be fatal.
Provide a daily calcium supplement along with UVB lighting to keep your bearded dragon healthy.
The Right Temperature for Bearded Dragons
Ideal temperature range
Bearded dragons require specific temperature ranges to thrive. The ideal ambient temperature range for an adult bearded dragon habitat is 75-85°F during the day and 65-75°F at night. Hatchlings and juveniles require slightly warmer temperatures of 80-90°F during the day and 70-80°F at night.
The basking area should be kept between 95-110°F to allow proper digestion and activity levels.
Maintaining the proper thermal gradient is crucial. If a bearded dragon gets too hot or too cold, it can lead to major health issues. Potential problems include appetite loss, lethargy, poor immune system function, and even death.
Use a quality thermometer to frequently monitor temperatures in different areas of the enclosure.
Basking spot temperature
A basking spot with adequate heat is essential for bearded dragons. This localized hot spot allows them to raise their body temperature to optimum levels for metabolism and digestion. Basking temperatures should reach 95-110°F.
The basking area should be the warmest part of the habitat. Position the heating lamp above a basking platform or branch so the dragon can sit within 6-10 inches of the bulb. The surrounding ambient temperature should be cooler, around 75-85°F, so they can thermoregulate by moving between zones.
Use a temperature gun, digital probe or thermometer to monitor basking zone temperatures daily. Adjust the wattage or height as needed. Lack of proper basking heat is a common problem for pet bearded dragons.
Nighttime temperature
While bearded dragons require high daytime temperatures, cooler temperatures at night are equally important. Switch off all heat lamps and basking lights after dark. Nighttime lows should drop to 65-75°F for adults and 70-80°F for juveniles.
Lower nighttime temperatures help stimulate healthy appetite and metabolism. It also initiates a proper day/night cycle for the bearded dragon. Make sure the enclosure cools adequately at night. You may need to use a ceramic heat emitter or under tank heating pad set to a low wattage during especially cold weather.
Conclusion
In summary, bearded dragons should never be exposed to red lights at night as it can negatively impact their health and sleep patterns. They require complete darkness at night along with an appropriate heat source that emits no light.
During the day, they need bright white light for proper circadian rhythms and UVB for healthy bone development. By providing the proper lighting and heating setup tailored to their natural habits, you can keep your bearded dragon happy and healthy.
