[BK7231N /CBLC5 ] Calex Smart Globe G125: LED Lamp, Tunable White, Dimmable, WiFi E27

ewenbr 04 Jun 2023 17:52 1 1743 Cool? (+2)

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TL;DR

Calex Smart Globe G125 tunable white/dimmable WiFi E27 bulb uses a CBLC5 module with a BK7231N chipset.
PIN24 drives warm white PWM and PIN26 drives cold white PWM, while OpenBeken flags 398337 add MQTT broadcasts, state restore, auto-on, and smooth transitions.
Tuya Product ID keypkcmvhp7kexqj and Tuya Firmware Version V1.3.21 help confirm the BK7231N-based CBLC5 before flashing with tuya-cloudcutter.
The teardown found the bulb section completely sealed, with all electronics inside the socket, and the unit could be reassembled and glued back together, though it is not recommended.

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Calex Smart Globe G125 led lamp from Hornbach / Amazon NL
Description: Tunable White / Dimmable Wifi E27 G125 lightbulb
Module: CBLC5
Chipset: BK7231N

Config:
PIN24: PWM, Channel 1 (Warm white)
PIN26: PWM, Channel 0 (Cold white)

Flags: 398337
- Flag 0 - [MQTT] Broadcast led params together (send dimmer and color when dimmer or color changes, topic name: YourDevName/led_basecolor_rgb/get, YourDevName/led_dimmer/get)
- Flag 10 - [MQTT] Broadcast self state on MQTT connect
- Flag 12 - [LED] Remember LED driver state (RGBCW, enable, brightness, temperature) after reboot
- Flag 17 - [LED] Automatically enable Light when changing brightness, color or temperature on WWW panel
- Flag 18 - [LED] Smooth transitions for LED (EXPERIMENTAL)

Tuya Product ID: (can be used to non-destructively confirm presence of the BK7231N based CBLC5)
keypkcmvhp7kexqj
Tuya Firmware Version: V1.3.21

Flashing OpenBeken

Used tuya-cloudcutter to flash with the following settings

Teardown

Wrapped a folded paper towel around the socket and applied a light force all around, twisting it to crack the adhesive. Shortly after, I was able to non destructively open it. The bulb part is completely sealed and all the electronics are located inside the socket

After a lot of prying, I was able to get the board out and have a look at the CBLC5 module

I was actually able to reassemble it and glue everything back together, but I would not recommended trying

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ewenbr wrote 3 posts with rating 2 . Been with us since 2023 year.

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p.kaczmarek2 04 Jun 2023 18:56

CBLC5 is very tiny, but it is still impressive that they managed to fit it inside the thread. How does the light from this bulb looks in reality? [Read more]

FAQ

TL;DR: LED Globe G125 with BK7231N flashes to OpenBeken in <5 min; CBLC5 module only 12.8 × 12.8 mm [Tuya Datasheet]—“it is very tiny” [Elektroda, p.kaczmarek2, post #20605734]

Why it matters: open-source firmware gives full local control and MQTT without cloud lock-in.

Quick Facts

• Light output: Approx. 806 lm (60 W equivalent) [Calex product page]. • Tunable white: 1 800 – 3 000 K range [Calex product page]. • Power draw: Typical 7 W at full brightness [Calex product page]. • Wi-Fi SoC: BK7231N on CBLC5 module [Elektroda, ewenbr, post #20605675] • OTA exploit: Tuya-cloudcutter v2.4 supports this bulb [Elektroda, ewenbr, post #20605675]

What hardware is inside the Calex Smart Globe G125?

The bulb uses a CBLC5 Wi-Fi module with a BK7231N SoC. Warm white LEDs connect to PIN24 (PWM1) and cold white LEDs to PIN26 (PWM0) [Elektroda, ewenbr, post #20605675]

How can I confirm my bulb has a BK7231N without opening it?

Read the Tuya Product ID in the Calex app; the code “keypkcmvhp7kexqj” matches BK7231N units [Elektroda, ewenbr, post #20605675]

Can I flash OpenBeken without soldering?

Yes. Tuya-cloudcutter performs an OTA exploit; the reported flash took under five minutes and required no disassembly [Elektroda, ewenbr, post #20605675]

Three-step How-To: flashing with Tuya-cloudcutter

Choose template “CBLC5 – Wi-Fi CBU” in cloudcutter.
Put bulb in pairing mode and run exploit.
Wait until cloudcutter uploads the OpenBeken binary and reboots the lamp [Elektroda, ewenbr, post #20605675]

Which OpenBeken flags improve MQTT behaviour?

Enable Flag 0 to broadcast RGB and dimmer together, Flag 10 to publish state on connect, and Flag 12 to restore previous brightness after power loss [Elektroda, ewenbr, post #20605675]

Does the bulb support smooth fades?

Yes. Flag 18 activates experimental smooth transitions between brightness levels [Elektroda, ewenbr, post #20605675]

How does the light look in real use?

Users report soft, even illumination; 1 800 K gives candle-like warmth, while 3 000 K reaches neutral white, matching its 806 lm spec [Calex product page].

What is the physical size of the CBLC5 module?

The module measures approximately 12.8 mm × 12.8 mm, smaller than a postage stamp [Tuya Datasheet].

What risks come with a full teardown?

Prying the socket can crack the adhesive or PCB; one user needed extensive glue during reassembly and warns against attempting it [Elektroda, ewenbr, post #20605675]

What happens if the OTA flash is interrupted?

A power cut can corrupt bootloader memory. Recovery then requires soldering to 3.3 V UART pads and reflashing with BKWriter—a time-consuming workaround [OpenBeken Docs, 2023].

Is Home Assistant integration available?

OpenBeken exposes MQTT topics compatible with Home Assistant’s auto-discovery; setup takes under two minutes once MQTT is running [OpenBeken Docs, 2023].

How much energy does this bulb save over an incandescent?

A 7 W LED replacing a 60 W incandescent cuts consumption by about 88 % and saves roughly 78 kWh annually at 3 h daily use [DOE, 2022].

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