CMB-24 RGB control board with 8 RGB channels.

CMB-24 RGB control board with 8 RGB channels.

Ready to incorporate basic RGB devices into your show?  You’ll need a specialized controller designed for three channel RGB based lights.  These types of RGB based LEDs are typically called ‘dumb RGB‘ because you manually control the red, green and blue intensities to create any color.

Dumb RGB devices require an external controller. A dumb RGB device can be as simple as a flood light you could command to be any color of the rainbow.  A dumb RGB device can also be a light ribbon or string of lights where all the lights are the same color at the same time.

The Light-O-Rama CMB24D RGB controller is specifically designed to handle up to eight dumb RGB devices.  The controller board can operate independently, as the director unit in a multi-controller network or as an add-on unit of a larger synchronized network of controllers.  Each of the eight RGB ports is broken down into three individual control channels (red, green and blue) and each channel has a number of special effects such as dimming, ramping, twinkle and shimmer.

What kind of lights work with the RGB controller?

Dumb RGB devices typically have four control wires: red, green, blue and a common anode (+). The entire RGB device (whether it's a flood, 5 meter ribbon of LEDs or string of 100 lights) is the same color at the same time, but you control the final color by mixing the intensities of red, green and blue.

The CMB24D controls Direct Current (DC) loads and is specifically designed for RGB based LED lighting with a common anode (+) configuration. It has two 30 amp DC inputs (one for each bank of four RGB ports) and can handle voltages up to 60VDC. If the supply voltage is below 12 volts, an auxiliary input is required to power the on-board electronics.

An appropriately sized power supply is needed based on the type of dumb RGB devices being used.  We have found the typical dumb RGB device runs on 12VDC and draws 5-20 watts so we usually recommend at least one 200 watt 12VDC outdoor rated power supply.

CMB24D RGB controller at work

Still can’t figure out what RGB technology can do for you?  Watch this video to see RGB in action on a real structure.  This is not a simulation.

In this video, eight (8) different dumb RGB based LED ribbons outline the windows, doors, gutter and stairs. The dumb RGB ribbons are outdoor rated (IP-65) and attached to the structure with 3M double-sided tape and/or staples.  Meant to be used year-round, the light ribbons can also be static or change colors with the season or event (Valentines, St. Patrick’s, 4th of July, etc.)

CMB24D RGB controller details

  • The CMB24D is a microprocessor controlled DC voltage controller. This deluxe controller takes its commands from an internal stored sequence, another controller, a Light-O-Rama Show Director, the Light-O-Rama ShowTime Sequencing Suite Windows based personal computer software or DMX-512.
  • The CMB24D can support interactive shows via three inputs activated by simple switch closures. One input can be used to start/stop an internal stand-alone sequence.
  • The RJ45 jacks on the CMB24D can be jumpered to support LOR networking or a standard DMX-512 E1.27 network.  Screw terminals permit easy connection of loads.
  • The microprocessor performs the lighting effects from high level commands, for example: fade channel 12 from 20% intensity to 60% intensity over six seconds. This internal intelligence allows for very complex shows where thousands of changes in the lights are possible every second.
  • Using a Show Director or the ShowTime Sequencing Suite Windows based personal computer software, the display can be choreographed to music.  A network of controllers allows animation of displays requiring high power and/or thousands of channels.
  • Easy to use software with powerful wizards facilitates the building of sophisticated lighting sequences choreographed to music and the assembly of the sequences into shows.

CMB24D RGB controller specifications

  • 60 amp DC controller
  • 8 pixel ports, each with three independent, 4 amps control channels (24 channels total)
  • Each pixel port is common anode based (typical for RGB LEDs)
  • All Light-O-Rama effects supported
  • Three trigger inputs
  • Storage for an internal standalone sequence (approx 10,000 commands)
  • Can direct itself and a network of Light-O-Rama controllers
  • Can be directed by a Show Director, another controller or by the ShowTime Sequencing Suite
  • Can monitor an input to start an internal standalone sequence (lights only, no music)
  • Up to 240 controllers on one data network
  • RJ45 network jacks can be configured for LOR or DMX (E1.27) wiring
  • 256 levels for smooth fading with durations from 0.1 to 25 seconds
  • Each 12 channel (4 pixel ports) bank can handle a different DC voltage between 5 and 30V
  • Unit address switches to set LOR or DMX-512 network address
  • Power supply connection for accessories
  • 7 1/4″ x 4″
  • Controller board only.  Does not include enclosure or power supply(s).


Already have a communications infrastructure using DMX-512 typically used in the entertainment industry? We've got you covered. Light-O-Rama light controllers are smart enough to analyze the type of data network they are connected to and adapt to DMX-512 if needed. Depending on the unique network assigned to your Light-O-Rama controller, it will occupy that DMX-512 address plus the next 23 (for a 24 channel controller.) The control channels (depending on the controller) must be in the same DMX-512 universe.
CMB24D Manual
On-line Store


CMB24D RGB controller basic layout

Basic layout showing CMB24D RGB dumb pixel controller

1.  The Light-O-Rama ShowTime Sequencing Suite works on your personal computer running Microsoft Windows and allows you to design your own shows.  The ShowTime Sequencing Suite then runs your shows and sends the right commands at the right time to the various control channels.  The ShowTime Sequencing Suite can even keep music and video synchronized to the controller commands.

2.  Speakers to play the music accompanying your show are attached to the computer sound card.

3. Your personal computer communicates to the Light-O-Rama controllers using a device plugged into the computer’s serial or USB communications port.  The blue line shows the standard serial output of the computer (RS-232 or USB) connected to our adapter that transforms the signal to the native Light-O-Rama network protocol (the green line) that then connects to our various types of controllers over standard computer network wire.  We recommend Cat 5 LAN cables available from us and off-the-shelf from your local big box store in the computer section.

4.  The Light-O-Rama CMB24D is connected to your network just like any other controller.  The board is designed to drive eight dumb RGB devices.  Each device has three channels (red, green, blue).  The dumb RGB devices are typically 12 volts.  Since we don’t know the types of RGB lights you will be using, you  must provide your own DC power supply.  Special note: Best practice is to mount the CMB24D in a weatherproof enclosure and make all wires exit the bottom so no water ever touches the electronics.

5.  The Light-O-Rama professional or residential high voltage AC light controllers include special effects such as simple on/off, intensities, smooth fading, twinkling, shimmering.  Over 200 controllers can be daisy chained, mixed and matched on one LOR network giving you the ability to command thousands of channels.  Need more channels?  Add another Light-O-Rama network.

6.  The Light-O-Rama professional or residential high voltage AC light controllers include special effects such as simple on/off, intensities, smooth fading, twinkling, shimmering.  Over 200 controllers can be daisy chained, mixed and matched on one LOR network giving you the ability to command thousands of channels.  Need more channels?  Add another Light-O-Rama network.