Bright, full spectrum light for happy marine tanks
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Give your corals the glow they love.
The Water Knight M5 brings clean, full spectrum light to your marine aquarium. It keeps colors bright, helps support coral growth, and gives your fish a natural, calm environment. Simple and strong, it’s a great fit for saltwater hobbyists who want their tank to shine.
Made for easy, everyday reef lighting.
✔ Full spectrum light supports healthy coral growth
✔ Two power options: 30W or 40W
✔ Bright, even coverage for marine tanks
✔ Simple setup with one LED light unit
✔ Helps fish and corals look their best
Wipe the LED surface gently with a dry cloth to keep it clear. Follow basic reef lighting habits by avoiding long periods of constant high intensity. Fits most standard marine aquarium setups depending on your chosen mounting solution.
We are proud to offer duty-free, reliable, tracked shipping— delivered to your door in over 200 countries worldwide!
Below you can check our average shipping times:
Domestic USA Shipping: 2-9 business days
US & Canada: 7-18 days
Europe: 7-18 days
Europe Plus*: 8-30 days
Australia, New Zealand: 7-18 days
Hong Kong, Singapore: 7-18 days
Rest of the world: 8-30 days
*does not include processing times up to 2 business days or longer in peak periods
Primarily we ship out from fulfillment centers in the United States, Eastern Asia and Western Europe. If the item you've purchased is out of inventory in your nearest location, we'll send it directly from our production lines at the same delivery times as stated in our shipping section.
Is the Water Knight M5 good for coral tanks?
Yes. Its full spectrum light makes it a friendly match for most marine corals.
Which power option should I choose?
The 30W works well for smaller tanks, while the 40W adds extra intensity for deeper or larger setups.
Does it work with any marine aquarium?
It fits most tanks. Just be sure you have the right mounting style for your setup.
The full spectrum output helps corals keep their color and grow strong.
Light spreads smoothly so your whole reef feels balanced and clear.
Pick 30W or 40W to match your aquarium’s size and lighting needs.
The single LED unit installs quickly so you can enjoy the glow fast.
Your fish look vivid under clean, steady reef lighting.
A dependable LED light made for marine hobbyists
| Features | MK Aquarium | Knock-Offs |
|---|---|---|
| Full spectrum marine lighting | ||
| Two power options for tank size | ||
| Even, bright reef coverage | ||
| Easy everyday use | ||
| Simple single-unit design | ||
| Great coral color support | ||
| Reliable marine performance | ||
| Works for most tank styles | ||
| Clear visibility for fish |
It offers steady, full spectrum light designed for most marine aquariums while staying gentle on fish and corals.
Yes. It’s simple to set up and works well for new marine hobbyists.
It stays cool for normal use, helping keep your tank stable.
Yes. Choose the 30W option for smaller or shallow tanks.
Most soft corals do fine. You can reduce photoperiod or mounting height to adjust intensity.
Most setups only need the correct mount. The light unit itself is ready to go.
Its natural spectrum keeps fish comfortable and makes colors look vivid.
LEDs generally last a long time with normal care, giving you steady lighting for years.
Yes. It’s designed for marine aquariums and everyday reef environments.
