The Casambi CBU-PWM4 dimming unit.
The Casambi CBU-PWM4 dimming unit.

Casambi CBU-PWM4 Compact Bluetooth Constant Voltage RGBW Dimming Wireless Control Unit

Manufacturer: Casambi


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Casambi’s CBU-PWM4 is a wireless dimming control unit for constant voltage luminaires and linear LED strip. With a 4-channel set-up, CBU-PWM4 specialises in RGBW and tuneable white (TW) Pulse Width Modulation (PWM) dimming allowing a maximum combined output current of 6A which can be freely divided between the 4 channels.

This unit is protected against overvoltage, overcurrent and short circuit situations. With an input of 12-24VDC and output of 72W at 12VDC or 144W at 24VDC. Requiring no external gateway device, keeping costs down, and utilising a Bluetooth Low Energy (BLE) mesh network which is considered as more reliable than WIFI based dimming units.

Control your lights via either the free app on your smartphone/tablet, existing standard wall switch or Casambi’s own advanced X-Press switch (see related products below).

For help with how to wire this unit, please see the datasheet guide in the downloads tab or contact us for further info - 01189 882294 / [email protected].

Casambi tutorial video:

Lightbulb with brain filament icon
- Our Top Tips -

  • Wireless control
  • 4 channel circuit - perfect for RGBW control
  • Make sure the units' input is from a 12-24VDC constant voltage driver only


Voltage range:

Max. input current:
4A (US and Canada)

No-load standby power

Output voltage
Same as input voltage

Max. output power
144W @ 24VDC
72W @ 12VDC
96W @ 24VDC (US and Canada)
48W @ 12VDC (US and Canada)

Max. output current
6A (can be freely divided between the channels)
4A (US and Canada)

Min. load requirement

Dimming method
Push dim [Pulse Width Modulation (PWM)]

Video on how the Casambi network works:


Product dimensions: W.73mm x D.18mm x H.30mm

Delivery and warranty

Delivery usually within 2-3 weeks

August factory shutdown

Lead times in July and August can be affected by European manufacturer summer shutdowns. Need it in a hurry? Let us know and we'll check availability for you.

About the manufacturer

Clever tech brand Casambi lets you instantly upgrade your existing lights into a whole new smart lighting system. It's driven by Bluetooth Low Energy (BLE) - an innovative wireless technology which is built-in to all smartphones and considered a more reliable alternative to WiFi and Zigbee. Incredible user experience is guaranteed as you can effortlessly control luminaires with a simple swipe of the app. Casambi lighting control works with its own native devices or with any manufacturers’ existing luminaires and wall switches, and it’s easily integrated into LED bulbs, drivers and modules. Based on wireless mesh networks with no single point of failure, this fully scalable smart lighting solution transforms lighting for the home and commercial spaces. It’s smart lighting made simple.

Founded by ex-Nokia workers Timo Pakkala and Elena Lehtimäki, Casambi provides the best smart home lighting. Save time by grouping luminaires together and creating one-tap scenes. Make morning and bedtime routines easier using the timer function. What’s more, you can boost your home security - as well as saving money and energy - by scheduling your holiday lighting requirements on the system’s calendar. In business, Casambi also powers cost-effective lighting automation for office and commercial environments. Daylight sensors and occupancy sensors achieve maximum lighting quality while reducing energy consumption; no gateway module is required thereby keeping costs down; and as part of an IoT system it’s got plenty to offer too. In retail spaces its firmware extension interface creates heat maps of people's movements, whilst in art galleries and exhibitions, location awareness technology triggers apps to display on visitors’ devices informing them about the object they’re viewing. Casambi supports many major standards, including Bluetooth 4.0 DALI and Philips Hue, and is compatible with all lighting manufacturers. What more do you need to know? No seriously, any questions just give us a call on 01189 882294, Live Chat with us, or email us at [email protected].

Got a question? Email us or call 01189 882294

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