48" MATRIXX II T5 Fixture

Grouped product items
48" MATRIXX II 4x54W T5

SKU: 209548

In stock

Discontinued by Bulk Reef Supply
$518.49 $609.99

- +
48" MATRIXX II 6x54W T5

SKU: 209550

In stock

Discontinued by Bulk Reef Supply
$759.99 $759.99

- +
48" MATRIXX II 8x54W T5

SKU: 209551

In stock

Discontinued by Bulk Reef Supply
$764.99 $899.99

- +

Giesemann has been known for making high-quality light fixtures that use the highest quality parts available, with a durable powder coat finish. Most people will actually call their light fixtures a piece of furniture with how they look. We have run multiple Giesemann lights for years and have been very happy with them. Between Giesemann fixtures and the many other light fixtures out there, just simply the quality of parts and thickness of material make the Giesemann light fixtures our first choice for almost any tank where the light will be mounted externally and be visible.


Fixture color is powder coated Black

  • Stylish Corrosion Resistant Anodized Aluminum Fixture
  • Tough High Gloss Twin Layer Powder Coat Finish
  • Independent Reflector for Each T5 Tube
  • Three Light Circuits Can be Switched Independently
  • Non-flickering lamp start
  • Full Electronic German Ballast with Non-Flickering Lamp Start
  • Optimized Ventilation - Passive and Active Cooling


T5 Lighting has been a proven method of lighting a reef tank that works. For a simple light fixture that is easy to install with either the mounting legs or hanging kit the Matrixx II T5 fixture is an amazing well-built light.

Depending on the number of lamps in the units, the power cords will be able to control different groups of lamps independently.  That allows you to set multiple timers or a controller to "ramp" the light up in the morning and down at night. The Matrixx II gives off a beautiful even light with 99.8% reflective reflectors that keep hot spots and shadows from forming and blending all the lamps into one cohesive color illumination.

With active and passive cooling technologies keeping your T5 lamps at the proper temperature for maximum par output and bulb life is taken care of by the Matrixx II fixtures. With a glass panel that seals off the top of the fixture acting as a giant heatsink, while keeping a beautiful aesthetic appeal. The Matrixx II units have a robust heavy duty extruded and formed aluminum alloy for the outer with hand assembly putting them all together. All parts are pre-painted before assembly to keep corrosion from forming and protect your investment.

Giesemann uses high-quality ballasts as they do understand for a slight bit more in ballast cost, the light output is much greater than the standard ballasts the industry uses.


Standard Non-Dimmable Matrix II T5 Lighting Fixture
25.6in 4 x 24 W 24in 22in 25.6 x 10.25in 98 Watt 
37.4in 4 x 39 W 24in 22in 37.4 x 10.25in 159 Watt
37.4in 6 x 39 W 24in 22in 37.4 x 17.25in 238 Watt
49.25in 4 x 54 W 24in 22in

49.2 x 10.25in

221 Watt 
49.25in 6 x 54 W 24in 22in 49.2 x 17.25in
329 Watt
49.25in 8 x 54 W 24in 22in 49.2 x 17.25in
442 Watt
61" 8 x 80 W 24in 22in .61 x 17.25in


6 and 8 lamp models use the Giesemann 435mm hanging kit

 Owners Manual

More Information
Lighting Type Fluorescent
Fluorescent Bulb Wattage 54 watt
Write Your Own Review
You're reviewing:48" MATRIXX II T5 Fixture
Your Rating
Only registered users can write reviews. Please or

Product Questions

In regards to the Matrix 6x54w fixture. If retrofitted with two ReefBrite XHO LED strips, will this fixture produce sufficient light for a SPS dominant tank measuring 60” Long x 24” Wide x 24” Height? If so, what height would you suggest mounting it over the tank?
Question by: Daniel Hamilton on Nov 2, 2017, 6:07 AM
Hi Daniel, thanks for reaching out!
That should be plenty of light for an SPS dominated tank provided you aren't trying to grow super demanding Acros across the entire length as there will be some dimmer areas on the end of the tank.
Based on our tests with the ATI fixture we suggest mounting the light around 6 above the water for minimal light spillage. Due to the fact this light would be a bit shorter than the tank you may want to hang it a bit higher for better coverage.
Hope this helps!
Answer by: Nick on Nov 25, 2017, 9:11 AM
Do/should the bulbs have to be oriented in a specific manor like the ATIs? I know on the ATIs the bulb should be on the side nearest the ventilation hole
Question by: Chris on Jan 26, 2017, 12:59 PM
Hey there! There isn't a specific bulb orientation for this fixture, other than your personal choice for the sequence of bulbs from front to back. :-)
Answer by: Randy on Jan 29, 2017, 6:55 PM
Hi, does this fixture come in white?
Question by: Frank on Jan 18, 2017, 12:28 AM
Hey there! Although many of us wish Giesemann made white products, they currently do not offer these in white. :-(
Answer by: Randy on Jan 19, 2017, 1:11 PM
which bulbs do you recommend for your 6 bulb fixtures? I see you utilize phillips ballasts so is a certain brand better suited than another? Thank You.
Question by: david estep on Jul 23, 2016, 4:39 AM
Hi there,
When it comes to T5 fixtures and what lamps to put in them, a lot of it will come down to what do you like to see and what are you trying to grow. For almost all fixtures we do a mix of 2x ATI Blue Plus, 2x ATI Aquablue Specials, 1x ATI Coral Plus, and 1x ATI True Actinic lamps. We find that mixture produces a nice spectrum around 16-18k and allows for good growth of most corals.
Answer by: Charlie on Jul 24, 2016, 11:03 AM
Question about your 48" MATRIXX II T5 Fixture - Giesemann. Since I have a canopy over my tank can you some how put this light on mounting legs or some sort of stands that they make? Will the Aurora Mounting Leg Set - Giesemann work since i DONT OR CANT HANG THIS FIXTURE?
Question by: Matt Paul on Apr 7, 2016, 5:34 PM
Great question!
Giesemann does have mounting legs available for the Matrixx fixtures. I have included a link below! Feel free to let us know if you have any further questions!
Answer by: Connor on Apr 7, 2016, 10:04 PM
how many power cords come on the 4 bulb unit to control "dusk / dawn " effect ? how many on the 6 bulb unit ?
Question by: CJ on Feb 8, 2016, 7:00 AM
Great question!
The 4 bulb will have 2 power cords while the 6 will have 3. Feel free to let us know if you have any further questions!
Answer by: Connor on Feb 10, 2016, 5:54 PM