For the constant-voltage RGB/RGBW architecture covered here, check the upstream DC power supply, separate multichannel controller, and shared conductors against each channel and the permitted combined load. Enough power-supply watts do not prove that the controller can switch every permitted color combination. First identify whether the load needs constant-voltage power, regulated LED current, or a digital pixel interface.
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This guide addresses commercial lighting and sign projects using an upstream constant-voltage DC source, a separate multichannel color controller, and documented compatible LED modules. Budget those components independently. A source such as the HLG-200-24 reference below is not an integrated RGB/RGBW controller; this article does not qualify a particular controller-and-source combination.
Identify the electrical architecture
“RGB LED driver” can describe different products. A constant-current multichannel driver regulates current through suitable LED strings. A constant-voltage controller switches power to compatible modules with their own current-limiting circuitry. An addressable pixel system also needs a defined data interface. These arrangements are not interchangeable. Review constant-voltage versus constant-current load interfaces before choosing the architecture.
The external CV/CC application guidance distinguishes a CV tape controller from a current-regulating driver. Confirm the actual module specification and terminal arrangement; neither an RGB label nor four wires establishes compatibility. A bare LED string must not be treated as a self-contained 24 V load.
For the CV architecture considered here, identify the DC source, color controller, and LED module separately. Obtain their voltage ranges, limits, channel definitions, and installation conditions. RGBW adds a dedicated white channel; its current need not equal a red, green, or blue channel.
When reviewing the upstream 24 V source role, use HLG-200 product details: HLG-200-24 variant y HLG-200 datasheet (PDF): HLG-200-24 column as document starting points. Check installed output capability and downstream-controller compatibility separately. This supply is not an RGB/RGBW controller, and the 9 A source capacity below is hypothetical rather than an HLG-200-24 rating.
Calculate each channel before the total
Original hypothetical example, not product specifications or measured WEHO performance: assume 8 m of compatible 24 V common-positive RGBW modules. At the stated condition, assume red, green, and blue each consume 4.8 W/m at full output, while white consumes 9.6 W/m. Assume simultaneous full output of all four channels is permitted by the module documentation.
Channel power equals length multiplied by full-output watts per meter; channel current equals power divided by 24 V. Actual tolerance, temperature, cable loss, and startup still require evaluation. The referenced RGBW-controller installation guide illustrates individual color-channel demand calculations; its device limits do not transfer to this example.
| Channel | Assumed demand | Channel power | Channel current |
|---|---|---|---|
| Red | 4.8 W/m | 38.4 W | 1.6 A |
| Green | 4.8 W/m | 38.4 W | 1.6 A |
| Blue | 4.8 W/m | 38.4 W | 1.6 A |
| White | 9.6 W/m | 76.8 W | 3.2 A |
White is the largest individual load. Dividing the combined 192 W equally among four channels would hide that difference and produce an incorrect channel requirement.
Compare the permitted operating states
Assume a hypothetical controller permits 4 A per channel but only 7.5 A across all outputs. Its electronics draw an assumed 2.4 W from the 24 V source, or 0.1 A, independently of LED demand. For the preliminary source screen, assume 9 A is available at 24 V under the specified installation conditions.
| Full-output state | LED current | Source including controller | Controller output-total screen |
|---|---|---|---|
| Red + green + blue | 4.8 A | 4.9 A / 117.6 W | Below assumed 7.5 A |
| White only | 3.2 A | 3.3 A / 79.2 W | Below assumed 7.5 A |
| All four channels | 8.0 A | 8.1 A / 194.4 W | Exceeds assumed 7.5 A |
Every channel is below 4 A, and 8.1 A is below the assumed 9 A source capacity. Nevertheless, the all-channel state exceeds the controller’s aggregate limit. A larger supply does not resolve that controller limit. This is an arithmetic rejection of one configuration, not approval of the other states.
Check per-channel and combined-output limits separately in the selected controller’s current documentation. A channel rating does not establish the total current available with all channels active. Apply the actual controller’s operating conditions and limits; the hypothetical 7.5 A screening limit above is not a specification for a commercial controller or a WEHO compatibility claim.
If a project prohibits simultaneous white and RGB, document how the restriction is enforced during startup, scene changes, communication loss, and service. A preferred everyday scene does not prove a higher-current state cannot occur.
Trace shared conductors and PWM current
In the assumed common-positive arrangement, the module’s shared positive feed carries the sum of active channel currents: 8 A with all channels at full output. The source feed and negative return also carry controller demand, reaching 8.1 A in this simplified example. A 1.6 A color branch does not make every conductor a 1.6 A circuit.
Confirm where currents combine, including connectors and distribution terminals. Common-positive and common-negative systems need different controller arrangements. Neither polarity nor a current limit can be established from cable colors alone.
Do not size conductors or declare supply compatibility from a dimmed average reading alone. PWM channels can overlap; combined pulse demand depends on controller timing and load behavior. Obtain its limits and test the intended combination. Evaluate voltage at the remote module using the DC cable-budget method where applicable.
Qualify the complete lighting assembly
Freeze module length and revision, controller settings, source model, cable routes, protection, enclosure, and temperature conditions. Test the electrical states the design permits. A luminous scene demonstrates operation at that moment; it does not establish channel capacity, thermal margin, or fault coordination.
| Check | Record | Acceptance basis |
|---|---|---|
| Each channel and permitted combinations | Channel/total current, module voltage | Individual and aggregate limits |
| Startup, fades, control loss and restoration | Current events, behavior, settings | Allowed states and recovery requirements |
| Continuous operation | Temperatures and operating conditions | Applicable component limits |
| Shared paths and distribution | Conductors, terminals, protection design | Actual aggregate duty and installation requirements |
Protocol choice and minimum-light behavior need a separate dimming and control-path review. This budget does not qualify a DMX, DALI, analog, or wireless control path.
Prepare a useful supply inquiry
Contact WEHO about the RGBW system DC source through the contact form with the module specification and length, controller model, per-channel/full-state budget, and installation conditions. Include the required input and permitted module voltage range. That package supports a source review while keeping color-control capacity with the controller manufacturer.
