48" Bluetooth Dimmable MATRIXX II T5 Fixture

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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

  • Fully Controllable with Built-in Bluetooth*
  • 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.


Using DIMTEC technology with the Matrixx II T5 fixtures now gives you full control of your T5 Lamps with their easy to use app or desktop software through Bluetooth. Controlling T5 lamps is just like other LED units but your T5 lamps will adjust their brightness with the program you upload to it. The dimmable Matrixx II lights are controllable through the free app available for any Android based device.


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.


Dimmable Matrixx II channels of control:

4 Bulb - 2 Channels

6 Bulb - 3 Channels

8 Bulb - 4 Channels

Two total power cords. One cord powers all the lamps. The other powers the cooling fans.


DIMTEC Controllable T5 Lighting Fixtures
GM-MTX614 37.4in 4 x 39 W 24in 22in 37.4 x 10.25in 159 Watt
GM-MTX616 37.4in 6 x 39 W 24in 22in 37.4 x 17.25in 238 Watt
GM-MTX714 49.2in 4 x 54 W 24in 22in 49.2 x 10.25in 221 Watt 
GM-MTX816 49.2in 6 x 54 W 24in 22in 49.2 x 17.25in 329 Watt
GM-MTX718 49.2in 8 x 54 W 24in 22in 49.2 x 17.25in 442 Watt 


4 lamp models use the Giesemann 260mm hanging kit

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

Android device required for dimmable control.


 Owners Manual

More Information
Lighting Type Fluorescent
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Product Questions

Does this light include mounting legs to sit on the aquarium?
Question by: Ronald Bryner on Nov 17, 2017, 9:55 PM
The Matrixx Lights do not include mounting legs, but they are available at the link below.
Answer by: Charlie on Nov 18, 2017, 7:56 AM
If I buy the giesemann 6 bulb t5 , what 6 bulbs would I need for corals.
Question by: Johnny on Jun 9, 2017, 1:49 PM
There isn't a specific arrangement of bulbs for corals, but in order to provide the necessary PAR/PUR output to meet the corals photosynthetic needs and provide good color, the ATI Blue Plus is a good starting bulb and would usually be recommended to be at least half of the bulb balance. From there, bulb selection largely comes down to white balance preferences for aesthetic appeal. If you like a whiter/warmer color for your tank, bulbs such as the Purple, and warmer Kelvin rated bulbs will help to balance the blue. If you like a bluer or cooler color temperature, Coral Plus and AquaBlue Special can be good in the mix.

Hope this helps!
Answer by: Zack on Jun 13, 2017, 11:45 PM
Hi, the 48" fixture should work for my 120 gallon right? Also should I go with 4 lamp or 6 for my tank size and bulb color for sps? And hanging is not an option will the leg mount that can be purchase separately fit on a non rimless tank?
Question by: Hoang Han on May 27, 2016, 10:32 PM
It certainly will work well and the 6 bulb would be ideal spread for SPS dominant tank. The legs will fit up to rims 2" wide. Feel free to let us know if you have any further questions!
Answer by: Connor on Jun 3, 2016, 12:39 PM
I can not get the bluetooth to discover the fixture. And the app Giesemann Matrixx BT is not found in the app store. Please help.
Question by: Luigi Alessi on Apr 25, 2016, 10:43 PM
Hey there,
I am sorry to hear about the connection issues. You will want to contact CoralVue right away to assist with resolving the problems with connection.

CoralVue http://www.coralvue.com/support/
Answer by: Connor on Apr 26, 2016, 2:37 PM
does this light have 0-10v input for apex control? or an adapter for the bluetooth to apex? please say yes.
Question by: wyatt on Feb 3, 2016, 11:08 PM
Great question!
Unfortunately the Giesemann fixtures do not have control outside of the Giesemann Bluetooth software. Feel free to let us know if you have any further questions!
Answer by: Connor on Feb 26, 2016, 9:06 AM
i want this light fixture in white, any chance?
Question by: rahm on Jan 21, 2016, 3:50 PM
Great question,
Unfortunately we are only able to receive these units in the gray color. Feel free to let us know if you have any further questions!
Answer by: Connor on Jan 27, 2016, 7:41 PM