Besides energy saving, controllability is the next highly expected feature of LED Lighting over Traditional Lighting. However, such a control aspect seems to be missing in daily applications. Since 2015, we've been developing & marketing Phase Dimmers* and related products to address LED dimming control

Driven by our project field experience, we developed a new type of Tunable White control using Phase Dimming & 0-10V technologies, which gives our Tunable White Controller (DZ1G300TUNE) & Dynamic Lighting Controllers (DZ2G300TUNE_TOGG / _PUSH). It's our goal to lower the technical and costs barriers for different Circadian Lighting or Commercial applications that desire Multi-Purpose Lighting.

* Our 450W / 220-240Vac Single Live-wire Operational Trailing-edge LED Phase Dimmers released to market includes DZ2G450DIAL & DZ1G450CAPS (2015), DZ3G450DIAL (2017), DZ4G450MULT (2018). In 2017, our DZ3G450DIAL was listed as a SORAA® Compatible dimmer. In Q2 2021, an Enhanced version of DZ3G450DIAL has been available.

In this Application Video Library, we shared a number of interesting topics on LED dimming or how our products can be applied in different scenarios.

Legend Tech DZ1G1TEN ( 1 - 10V Controller ) with Electronic Dimmable Ballast

Legend Tech DIMEZE™ DZ1G1TEN 1-10V controller is designed for LED dimming applications. On the other hand, dimmable ballast has a different circuit structure, which introduces a potential shielding concern for simple 1-10V controllers in such application. Shielding is a common electrical topic, which basically means external interference to the control signal running via a cable.

Here, we have an Electronic Dimmable Ballast from HEP (model # DS214-35) that is connected to two 14W T5 tubes and our DZ1G1TEN. For this type of application, please make sure the Earth wire must be connected to the ballast (no floating or NC). If it’s floated, when you touch the metal casing of the ballast, the T5 brightness level would change.

It’s important to realize that in the typical ballast circuit design, the current supply from the AC to the 1-10V control terminals is done via a “transformer”. After we opened this particular ballast, we’ve found that the current is further reduced by a thermo-sensitive resistor, thus the actual current that flows in-and-out of the 1TEN controller via the DIM+ and DIM- control wires would be even smaller. That means the controller would be highly subject to external interference. If you touch the controller’s wiring terminals by hand, you’ll find a brightness drop from the T5 even with the shielded cable that we now use for the 1-10V terminal connection; the brightness drop would be worst if non-shielded cables are used combined with a floated Earth wire to the ballast. Under the normal scenario in which no touching to the lighting equipment and that the dimmer is installed properly inside the wall box, the DZ1GTEN controller would function with the Electronic Dimmable Ballast as we shown in the beginning of the video. For our suggestion in this scenario, please see relevant topic in our Support section.


If customers decide to use our DZ1G1TEN for ballast dimming application, please be aware of the potential shielding issues as covered. For us, using our device as-is for such application is not recommended. If the shielding issue still remains after you’ve tried the various common approach to fight the issue, our recommendation is to switch to a 0-10V controller (above right), which has its own AC power supply (4-wire terminals: 2x AC and 2x Control), which should be much more stable against the mentioned shielding issue. 

At last, we emphasize that the DZ1G1TEN is designed for LED dimming. For its applications with different LED drivers, please refer to our other videos in the library.