UNS Mini Refugium Light Review: Compact Algae Cultivation for Reef and All-In-One Tanks

Introduction

The UNS Mini Refugium Light is a compact LED fixture designed to support algae cultivation in refugium chambers of UNS Dual All-In-One tanks and UNS Reef Systems. It comes in two mounting variants: a magnetic version optimized for UNS tanks, and a clip-on version for non-UNS aquariums. The light includes an inline controller with programmable scheduling, eight intensity settings, and water-resistant construction.

Who This Light Is For

This refugium light suits aquarists running UNS Dual All-In-One or UNS Reef System tanks who want to cultivate macroalgae for nutrient export and biological filtration. The magnetic variant is purpose-built for UNS refugium accessories, while the clip-on version works with any tank type where you need to mount a light to a glass or frame edge.

Refugium lighting is most relevant for reef keepers who prioritize water quality management through algae-based nutrient reduction, or for planted aquarium hobbyists seeking a dedicated light source in a separate chamber.

Design and Mounting Options

The light unit itself is compact and water-resistant, making it safe for proximity to water even if splash occurs. The magnetic version includes a small magnet with 3M adhesive tape, allowing you to mount the light to aluminum posts or crossbars on your stand without drilling or permanent fastening. This approach keeps the light secure while remaining removable.

The clip-on variant uses a fastener with a wrench-tightened screw mechanism. Installation involves hooking the clip onto your target surface and tightening the fastener carefully to avoid over-tightening, which could damage the light or glass.

Both versions ship with a controller holder designed to be mounted in your cabinet using 3M or double-sided tape, keeping the inline controller organized and out of sight.

Controller and Scheduling Features

The inline controller is the operational hub of the system. It features a digital display and four buttons: UN (power and mode), up/down arrows (brightness adjustment), and set (confirm and lock settings).

Power control is straightforward: hold the UN button to turn the light on or off. Once powered on, you can cycle through eight different light intensity options by pressing the UN button once per selection, then pressing set to lock your choice. The up and down arrows let you adjust brightness from 1 to 10, with set confirming the level.

The scheduling system requires you to set the current time first by holding the set button and adjusting hours and minutes. The display shows AM times without a colon and PM times with a colon visible. After setting the current time, you can program a turn-on time and a turn-off time, each confirmed by pressing set. Once configured, the light runs on this schedule automatically.

A useful feature is the ability to switch between scheduled mode (AS) and always-on mode (AC) by double-clicking the UN button. Always-on mode is helpful if you want to connect the light to an external plug timer or controller for more complex automation.

Installation on UNS Dual All-In-One Tanks

For Dual All-In-One tanks, the light mounts inside the included refugium box. You position the light so it faces into the refugium chamber, then slide the entire assembly into the overflow section where it hangs on the baffle dividing the return pump and middle chamber.

The refugium chamber itself is not designed to hold water, so UNS recommends adjusting the box height so the opening sits above the waterline. However, the light is water-resistant, so minor water contact is not a concern.

Installation on UNS Reef Systems

Installation on UNS Reef tanks (tested here on the R60, but consistent across all sizes) uses a refugium chamber lid with included mounting clips and vinyl screws. The process involves:

1. Placing the rectangular-cutout clip on the holes nearest the finger hole on the refugium lid, then barely screwing it in with vinyl screws.
2. Lifting the clip and sliding the light in with the LED side facing up.
3. Positioning the second clip aligned with the bottom holes and securing it with vinyl screws.
4. Fully tightening all vinyl screws to lock the light in place.

Once the refugium is mounted to the lid, you run the power wire through the cutout dividing the refugium chamber from the pump chamber, then place the assembled lid on your sump. The installation is straightforward and requires no tools beyond the included wrench and vinyl screws.

Conclusion

The UNS Mini Refugium Light is a purpose-built solution for aquarists using UNS tanks who want a dedicated light source for algae cultivation. The magnetic mounting, programmable scheduling, and water-resistant design make it practical for reef and all-in-one setups. The clip-on variant extends compatibility to other tank types, though the magnetic version is optimized for UNS systems. If you run a UNS Dual All-In-One or Reef System and maintain an active refugium, this light offers a straightforward way to support macroalgae growth without the complexity of full-spectrum reef lighting.