How to Set Up the Week Aqua L Series PRO-K for Maximum Plant Growth

If you’ve chosen the Week Aqua L Series PRO-K, you already own one of the most advanced lighting systems in modern aquascaping. Designed for planted tanks that demand accuracy, depth, and consistency, the PRO-K is built to bring out the best in your plants.

Setting it up may seem technical at first, but it’s actually quite simple. With the proper placement, settings, and schedule, you can achieve exceptional growth and vibrant color while keeping algae under control. This guide will walk you through each step, from unboxing to final tuning, so that you can get the most out of your new light.

Step 1 – Unbox and Inspect Your L Series PRO-K

Start by carefully unpacking your fixture and checking all components. Inside the box, you’ll find the PRO-K light unit, power adapter, mounting brackets or stand kit, and user manual.

Before installation, inspect the light body for any transit damage or loose fittings. The PRO-K’s frame is made of solid aluminum, which feels sturdy and acts as a passive heat sink. Its waterproof sealing protects internal components from humidity and condensation, one of the key reasons Week Aqua fixtures are known for their longevity.

Once everything looks good, keep the mounting hardware nearby and proceed to position your light.

“A few minutes of inspection now ensures years of flawless lighting performance.”

Step 2 – Mount the Light at the Right Height and Angle

Mounting height plays a significant role in how evenly light spreads across your tank. For most planted aquariums, position the PRO-K around 25 to 35 cm (10 to 14 inches) above the water surface.

• Closer mounting (20–25 cm) increases PAR and intensity, ideal for CO₂-injected, high-tech setups.

• Higher placement (30–35 cm) softens the spread, preventing glare and giving a more natural daylight look for low-tech tanks.

Center the fixture directly above your tank’s midpoint to distribute light evenly from front to back. If your aquarium is rimless or tall, consider using Week Aqua’s hanging kit or mounting brackets for better stability and aesthetic balance.

“Correct height ensures your plants get light energy, not glare.”

Step 3 – Connect and Power Up Safely

Before plugging in the power adapter, make sure your power strip or socket is positioned above flood level and away from moisture. Arrange the cable neatly behind your tank to prevent splashes or tension.

Connect the adapter to the light, then power it on. You’ll notice the soft startup glow, designed to prevent sudden light shock to your fish and plants. Check that all LEDs illuminate evenly and that the color tone appears consistent across the length of the fixture.

The PRO-K operates silently, thanks to its fanless cooling system. The aluminum body naturally dissipates heat, so there’s no noise, vibration, or fan maintenance.

“Power, safety, and positioning are just as important as performance.”

Step 4 – Adjust Spectrum and Intensity for Your Tank Type

This is where the PRO-K truly shines. It uses a balanced RGB+UV spectrum that mimics natural daylight with a CRI rating above 95. This ensures accurate color rendering and strong photosynthetic performance for your plants.

Here’s how to adjust intensity based on your setup:

• High-tech tanks (with CO₂): 80–100% brightness for 6–8 hours per day.

• Low-tech tanks (no CO₂): 60–75% brightness for 7–9 hours per day.

If you notice pale leaves or algae growth, reduce intensity slightly or shorten your light period by 30 minutes. Each aquarium is unique, so finding the “sweet spot” often takes a week or two of observation.

For precise control, connect the Bluetooth Module 3.0, which allows you to dim, program sunrise and sunset effects, and save custom settings from your phone.

Step 5 – Set an Optimal Lighting Schedule

Light consistency is just as important as intensity. Plants rely on predictable photoperiods to regulate growth and photosynthesis. Inconsistent schedules often cause algae blooms or stunted growth.

Here’s a simple reference table to start with:

Begin with shorter durations and gradually increase over two weeks. This lets your plants acclimate to the new spectrum and prevents sudden algae growth.

The PRO-K’s output remains stable even during extended operation, ensuring consistent PAR and color quality day after day.

Step 6 – Sync Lighting with CO₂ and Fertilization

For high-performance planted tanks, syncing your light schedule with CO₂ injection and nutrient dosing can dramatically improve growth.

Here’s an effective routine:

• Start CO₂ injection one hour before lights on to allow gas to reach optimal levels.

• Turn off CO₂ 1 hour before lights out to prevent an overnight buildup.

• Do fertilizers soon after the lights turn on when photosynthesis begins.

This synchronization ensures your plants use energy efficiently, producing healthy growth and fewer algae issues. The PRO-K’s consistent light spectrum helps maintain this balance, allowing plants to absorb CO₂ and nutrients at their peak.

“Great growth happens when light, CO₂, and nutrients speak the same language.”

Step 7 – Fine-Tune with Bluetooth Control (Optional)

If you prefer hands-free control, the Week Aqua Bluetooth Module 3.0 is an excellent upgrade. It plugs directly into the PRO-K and connects to your smartphone through the Week Aqua app.

Key features include:

• Custom dimming presets for morning, midday, and evening light.

• Sunrise and sunset simulation to create a natural daily rhythm.

• Timer-based scheduling so you never forget to turn lights on or off.

The app stores your preferences, so settings remain intact even after power interruptions. It’s perfect for users who travel or prefer consistent automation without manual adjustments.

“Smart control turns precision lighting into effortless lighting.”

Step 8 – Maintain and Clean Regularly

A little maintenance keeps your fixture performing like new. Wipe the aluminum surface every two to three weeks with a soft, dry cloth to remove dust or condensation marks. Avoid alcohol or potent cleaning agents, as they could damage the finish.

Check the mounting brackets and cables during water changes to ensure they remain secure and dry. The PRO-K’s waterproof seal prevents internal damage, but keeping connectors clean helps preserve efficiency.

If you notice reduced brightness after several months, gently clean the LED cover with a microfiber cloth to remove any mineral deposits. This simple care routine keeps your PAR output strong and color rendering consistent.

FAQs

What height should I mount the PRO-K above the tank?

Around 25–35 cm (10–14 inches) provides balanced intensity and even spread.

Can the PRO-K run without CO₂?

Yes. Use 60–70% intensity and extend the photoperiod slightly for stable growth.

Does the PRO-K produce noticeable heat?

Very little. Its aluminum body naturally disperses heat, keeping the unit cool and silent.

How do I control algae under strong lighting?

Maintain steady CO₂, use balanced nutrient dosing, and avoid excessive light duration.

Can multiple Week Aqua lights run together?

Yes. You can operate several fixtures using individual adapters or link them with the Bluetooth Module 3.0 for synchronized control.

Conclusion

The Week Aqua L Series PRO-K isn’t just another aquarium light; it’s a precision tool that transforms plant growth through balanced spectrum and high CRI accuracy. When installed at the correct height, tuned for the right intensity, and paired with a steady schedule, it creates the perfect environment for lush, vibrant aquascapes.

For those who want even greater control, the Bluetooth Module 3.0 offers smooth automation and stress-free adjustments. Smaller tanks can pair beautifully with the Z400Z PRO, which shares the same engineering DNA in a compact form.

Set it up once, fine-tune your routine, and enjoy a thriving, natural-looking underwater world that grows beautifully for years.