We use cookies to make your experience better. To comply with the new e-Privacy directive, we need to ask for your consent to set the cookies. Learn more.
Here you will find the most frequently asked questions about UV light in the terrarium
General Questions about Aquarium Lighting
1. Why is good aquarium lighting important? Good lighting promotes plant growth, enhances fish colors, and ensures a healthy ecosystem. Insufficient or incorrect lighting is one of the most common reasons why plants struggle or algae proliferate.
2. How many watts of LED do I need for my aquarium? As a rule of thumb: 0.3–0.5 watts of LED power per liter of tank volume for a normally planted freshwater aquarium. For demanding plants or deeper tanks, aim for the higher end of this range. The easiest way is to provide your tank's length and depth, and we can recommend the right model for you – the consultation is free.
3. Why are LED light bars better than conventional fluorescent tubes? LEDs are more energy-efficient, longer-lasting, and generate less heat. They also offer individually adjustable light colors and brightness levels, which is not possible with T5/T8 tubes.
4. Which light color is best for my aquarium? That depends on the fish you keep. Daylight white LEDs (approx. 6,500 Kelvin) are ideal for plants, while bluish light (10,000 Kelvin and above) makes corals fluoresce and visually enhances their appearance in saltwater aquariums.
5. How long should the aquarium lighting be on each day? Between 8 and 12 hours to mimic the natural day-night cycle. Important: Longer is not better – excessive lighting is one of the main causes of algae growth, not insufficient light.
6. Do I need a timer for my LED lighting? Yes, a consistent light cycle is more important than precise timing. A simple external timer is perfectly adequate for entry-level models. Premium LEDs with app control already have a built-in timer function, including sunrise and sunset simulation.
Buying decision: Budget or premium?
7. What is the difference between budget and premium LEDs – and which is right for me? Inexpensive LEDs offer a solid standard spectrum – perfectly adequate for a typical freshwater planted aquarium. Premium models additionally offer individually adjustable light colors, app control, and usually stronger blue/UVA components for corals or particularly demanding plants. A rule of thumb: An entry-level model is sufficient for your first aquarium, while premium models are worthwhile for saltwater aquariums or if you want full control over lighting programs.
8. Is it worth switching from old T5 tubes or first-generation LEDs to modern LED light bars? In most cases, yes. Modern LEDs consume significantly less energy, last longer, and offer a fuller spectrum – noticeable in more vibrant fish colors and improved plant growth. The energy savings often offset the initial investment over time. If your plants are barely growing or your fish colors appear faded, this is a clear indication that a switch is worthwhile.
Technical questions about LED light bars
9. Can I use LED light bars in any aquarium? Yes, LED light bars are available in various lengths for open and closed aquariums. It's important that the bar length matches the aquarium length – models that are too short will create dark areas around the edges.
10. Are LED light bars waterproof? Most models are splash-proof, but not designed for direct underwater use. They are mounted above or on the aquarium rim, not submerged in the water.
11. How do I attach an LED light bar? Most models have brackets for the aquarium rim or can be mounted with clips – no drilling or gluing required.
12. Can I adjust the LED brightness and color temperature? Yes. Basic models can be dimmed using a switch, while premium models can be controlled via an app – where you can also program color temperatures and complete daily cycles, such as sunrise and sunset.
13. Which app do I need to control the premium LEDs? The "Week Aqua" app (free for iOS & Android) allows control via Bluetooth – brightness, light color, and schedules can be set directly from your smartphone.
14. What is UVA light (actinic light) and what is it good for? UVA/actinic light causes corals and some fish to fluoresce – an optical effect that is primarily responsible for the typical vibrant blue and green tones in saltwater aquariums. For the photosynthesis of your plants, however, the visible red and blue range of light is crucial, not UVA.
15. Can LED light bars prevent algae growth? They can't prevent it directly, but the right light spectrum in combination with a moderate lighting duration (8–10 hours) significantly reduces the risk. Algae usually develop due to excessive lighting or an unbalanced spectrum, not the LED itself.
Maintenance & Durability
16. How often do I need to replace the LEDs? Depending on the model, LEDs last between 20,000 and 50,000 operating hours – at 10 hours of daily use, that's several years, often significantly longer than fluorescent tubes.
17. Can LED light bars overheat? LEDs generally generate less heat than T5/T8 tubes, but they can still overheat – especially with poor ventilation or continuous operation without a break. Therefore, high-quality models have active heat sinks or small fans. A short safety distance from the water surface and some air circulation are usually sufficient.
18. Can I use LED light bars for freshwater and saltwater aquariums? Yes, there are special models for both types of aquariums. Saltwater LEDs usually have additional blue and UVA light for corals, while freshwater models are more focused on the red/blue range for plant growth.
19. How do I clean my LED light bar? Simply wipe with a soft, damp cloth – do not use aggressive cleaning agents or solvents, as these can damage the coating.