In practice, many of our product support cases can be
traced back to product compatibilities and site implementations. To name a few
common customer questions: What dimmable drivers can we use? How many lamps can
be connected? Can we use brand PPP dimmable lights with your dimmers?
to answer these correctly, thorough tests with the actual products shall be in
place before installation. Although we’ve been doing these tests with some
market available products, the abundance of lighting products in the market and
the material costs have forbidden us from doing thorough tests. For example, in
a recent residential building project, we worked with an Emergency Battery Kit supplier
to validate our LED fixtures that our lights could pass the required discharge
duration period to clear the technical compatibility.
said, we hope that sharing the field encountered issues would let customers
understand the pro-and-cons and the technology's limitations. Our goal is to
raise to customers to at least test the critical elements for a smooth dimming
experience. So, in this section, we shall address issues in the actual
installation, such as unstable light at peak level and cross-talk issues when
multiple dimmers are in place.
Flickering at Low and Peak Intensities
our standard LED dimmer modules can support maximum loading of 450W, sometimes,
customers only desire to dim a single LED lamp in a room, such as a dimmable
LED GU10 lamp. Two things to note in this case, especially when integral drivers
are involved, meaning the option to replace the driver is not available.
even if our dimmers can support dim-to-off performance (or the lamp no longer
provides any visible light output), it's possible to find unstable light output
below a specific light output level and just before the lamps go dim-to-off. If
we use a power meter to measure the total power consumption of the dimmer and
the GU10, we will find the power is already at a low level. To ensure
sufficient electricity supply for the entire string, contractors shall set a
minimum brightness level with a stable minimal visible light to limit the
customers occasionally find that a single dimmable lamp can show flickering at
the peak intensity level. In such cases, the integral driver likely causes this
by not drawing enough current from our dimmer at the peak intensity level.
Hence, the unstable performance of our dimmer at the peak intensity level. This
situation is similar to the inconsistent light output with a particular
combination of a non-dimmable LED MR16 lamp and a 12Vac electronic transformer.
The problem will be solved when more lamps, usually 2 to 3 LED lamps of the
same model. Suppose different models or manufacturers’ products are involved.
In that case, there must be at least one lamp that can function adequately with
the dimmer at the peak intensity to ensure proper operation for the whole
that our DZ3G4350DIAL and DZ4G450MULT dimmers have different circuit designs,
so the issue found with our DZ3G450DIAL may not appear with our DZ4G450MULT at
all, vice versa. Electrical Contractors or Lighting Consultants should take
note of this possibility and include this in their test for compatibility in
their product selection stage. So, if they are aware that the project would
require dimming a single light source, they are advised to include this in
their tests ahead of time.
Cross-Talk with Multiple Dimmers
with the dimmable LED GU10 lamp examples. After the installation, sometimes
Electrical Contractors can find irregular and frequent flickering with most of
the lights in the office, which is very annoying. Not only irritating, but end
customers usually won’t sign off for project completion in such cases. Suppose
the lights are all connected to different dimmers; contractors suspect the dimmers
cause that. Furthermore, the situation becomes confusing, especially after the
contractor connects a single dimmer with all the same GU10 lamps dismounted
from the lighting fixtures, as an isolated circuit (for example, using an AC
outlet), everything works fine!
in this kind of situation can be more difficult if multiple dimmer brands are
involved! One way to examine would be to investigate for cross-talk. The
cross-talk concern may come into play, especially if the contractor found that
changing the light intensity using a dimmer (dimmer A) would also affect other
lights’ intensity that is supposed to be dimmed by another dimmer (dimmer B).
In other words, the lights in Zone C are also affected by another dimmer in
Zone D as we adjust the dimmer for different zones.
refers to the undesired transfer of signals between the communication channels.
Cross-talk can be relevant in lighting applications because it is common for
all lights to share the Neutral connection for a joint return to the MCB. While
this is a common practice, we should understand that this shared Neutral
connection approach creates a “common circuit” with many unintended paths among
the individual circuits (zones), which results in strange circuit behaviors.
Simply put, this makes the circuit paths for multiple dimmers interfere with
the others or have multiple dimmers on the same line! To solve this problem, we
advise the Electrical Contractors to examine any shared Neutral connection and
separate them as much as possible before further investigation.