[BK7231 - CB2L] Moes LED Light Bulb 14W RGB C+W E27

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Post #1
20446275 19 Feb 2023 09:15

I received a new bulb from Moes, it costs $9.49 with free shipping
https://www.aliexpress.com/item/1005003473033205.html
This is a heavy bulb and it's indeed very bright

The bulb uses BK7231 - CB2L but unfortunately Moes filled the bulb with epoxy and I couldn’t disassemble it without causing permanent damage.
But thanks to Lightleak project I was able to get full dump of the chip without the need to open it further. I uploaded the .bin file to tuya-cloudcutter and it can be found under the profile with firmware version 1.3.1

Here are some pictures of the bulb.

As you can see the bulb was advertised as CW+WW+RGB but it only has WW+RGB diodes and it emulate the CW. That’s why Flag 24 must be enabled.
After flashing Openbeken use the following configuration

P6 - PWM 0
P8 - PWM 4
P24 - PWM 2
P26 - PWM 1
Also don't forget to enable Flag 24

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#2 20448864 20 Feb 2023 15:16

p.kaczmarek2 p.kaczmarek2

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Post #2
20448864 20 Feb 2023 15:16

Thank you, very useful review. I can also see that you have the same power metering util that I have. I have reviewed it on the polish side of Elektroda:
https://www.elektroda.pl/rtvforum/topic3655635.html
Hmmm does the "white emulation" gives good enough results?

I am creating multiplatform open source firmware (Tasmota replacement), right now supporting BK7231T, BK7231N, XR809, BL602, W800, W600, LN882H and soon supporting RTL and W701:
https://github.com/openshwprojects/OpenBK7231T
If you like my work, support me at: https://paypal.me/openshwprojects

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#3 20448910 20 Feb 2023 15:53

Zain00 Zain00

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Post #3
20448910 20 Feb 2023 15:53

This meter is surprisingly accurate given its price

I mostly use this bulb at 2700k, but I have noticed a flickering when using the emulation.
https://youtube.com/shorts/6Ef-RvJqDAg
https://youtu.be/ZUlcGBesySo
Now, I haven’t done much testing with the original firmware so I don’t know if it’s a bulb issue or OpenBeken issue.
What I noticed before flashing OpenBeken is the RGB diodes doesn’t turn off completely when turning the bulb off, I can see them run at very low brightness if I was in a dark room. I have contacted the seller about this issue but no respond yet.

If I turn on RGB colors only I don't see any flickering.
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#4 20448924 20 Feb 2023 16:06

p.kaczmarek2 p.kaczmarek2

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Post #4
20448924 20 Feb 2023 16:06

Are you able to compile the OpenBL602 yourself? I can be done online on github.

Maybe you just need a different PWM frequency. Hmm.

I am creating multiplatform open source firmware (Tasmota replacement), right now supporting BK7231T, BK7231N, XR809, BL602, W800, W600, LN882H and soon supporting RTL and W701:
https://github.com/openshwprojects/OpenBK7231T
If you like my work, support me at: https://paypal.me/openshwprojects

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#5 20448932 20 Feb 2023 16:15

Zain00 Zain00

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Post #5
20448932 20 Feb 2023 16:15

Are you refering to this bulb ? this one is Beken chip

I don't use white emulation on this one but I you want to do some testing I can help.
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#6 20448960 20 Feb 2023 16:29

p.kaczmarek2 p.kaczmarek2

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Post #6
20448960 20 Feb 2023 16:29

Ah, sorry, it's BK, I was confused.
Ok, so maybe try this option:

I am also considering adding frequency customization for PWM.

I am creating multiplatform open source firmware (Tasmota replacement), right now supporting BK7231T, BK7231N, XR809, BL602, W800, W600, LN882H and soon supporting RTL and W701:
https://github.com/openshwprojects/OpenBK7231T
If you like my work, support me at: https://paypal.me/openshwprojects

Helpful post? Buy me a coffee.
#7 20448967 20 Feb 2023 16:34

Zain00 Zain00

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Post #7
20448967 20 Feb 2023 16:34

Flag 11 - ON, still flickering
#8 20448994 20 Feb 2023 16:49

p.kaczmarek2 p.kaczmarek2

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Post #8
20448994 20 Feb 2023 16:49

If you have time to play around, give me few hours or so and I may prepare a build with an option to configure PWM frequency from console command.

Right now i am working on Web App and configuration API so users dont' have to use console commands too often.

I am creating multiplatform open source firmware (Tasmota replacement), right now supporting BK7231T, BK7231N, XR809, BL602, W800, W600, LN882H and soon supporting RTL and W701:
https://github.com/openshwprojects/OpenBK7231T
If you like my work, support me at: https://paypal.me/openshwprojects

Helpful post? Buy me a coffee.
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Topic summary

The discussion revolves around the Moes LED Light Bulb 14W RGB C+W E27, which utilizes the BK7231 - CB2L chip. The bulb is noted for its brightness and weight, but the user encountered issues with flickering when using white emulation after flashing OpenBeken firmware. The RGB diodes remain dimly lit even when turned off, prompting the user to contact the seller for support. Other participants suggest potential solutions, including adjusting PWM frequency and compiling OpenBL602 firmware. The conversation includes shared experiences with power metering accuracy and the need for further testing to determine the source of the flickering issue.
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[BK7231 - CB2L] Moes LED Light Bulb 14W RGB C+W E27

FAQ

TL;DR: The Moes 14 W RGB + W E27 bulb draws 13.8 W and delivers ≈1,300 lm[Elektroda, Zain00, post #20446275]; as p.kaczmarek2 says, “maybe you just need a different PWM frequency”[Elektroda, p.kaczmarek2, post #20448924] Lightleak lets you dump firmware without opening the epoxy-potted shell. Why it matters: OpenBeken users can avoid flicker and unlock full control.

Quick Facts

BK7231T (CB2L) Wi-Fi SoC inside the driver board[Elektroda, Zain00, post #20446275]
Advertised CW+WW+RGB, actual WW + RGB only; cool-white is software-emulated[Elektroda, Zain00, post #20446275]
Retail price: US $9.49 with free shipping (Feb 2023)[Elektroda, Zain00, post #20446275]
Factory firmware v1.3.1 profile available in Lightleak dump[Elektroda, Zain00, post #20446275]
Recommended OpenBeken GPIO map: P6→PWM0, P8→PWM4, P24→PWM2, P26→PWM1, with Flag 24 enabled[Elektroda, Zain00, post #20446275]

1. What microcontroller does the bulb use?

The driver board carries a BK7231T on a CB2L module, combining 32-bit MCU and 2.4 GHz Wi-Fi[Elektroda, Zain00, post #20446275]

2. Can I open the bulb for hardware hacking?

Moes filled the housing with hard epoxy, so mechanical disassembly usually destroys LEDs and optics—plan on software methods instead[Elektroda, Zain00, post #20446275]

3. How did users extract the original firmware without opening the shell?

The Lightleak tool exploited an OTA vulnerability: connect bulb to Tuya CloudCutter, request backup, and download the 1.3.1 binary—no soldering needed[Elektroda, Zain00, post #20446275]

4. How do I flash and configure OpenBeken on this bulb?

Follow the 3-step sequence:

Upload the compiled BK7231T OpenBeken image via tuya-cloudcutter.
Log into the bulb’s web UI; set pins P6=PWM0, P8=PWM4, P24=PWM2, P26=PWM1.
Enable Flag 24 (white emulation) and reboot[Elektroda, Zain00, post #20446275]

5. Why is cool-white emulated?

The PCB lacks separate cool-white chips; firmware mixes warm-white and RGB to approximate 6500 K, requiring Flag 24 for correct ON/OFF logic[Elektroda, Zain00, post #20446275]

6. Does white emulation flicker?

Yes, users report noticeable flicker at 2700 K with emulation on, while pure RGB modes stay stable[Elektroda, Zain00, post #20448910]

7. How can I reduce the flicker?

Try raising PWM frequency; Flag 11 toggles an alternate ISR but did not solve it[Elektroda, Zain00, post #20448967] A custom OpenBeken build allowing console-set PWM kHz is in development[Elektroda, p.kaczmarek2, post #20448994]

8. What is the ghost-glow issue when the bulb is off?

Some units leave RGB LEDs dimly lit after OFF, indicating leakage current or firmware bug; seller has not responded yet[Elektroda, Zain00, post #20448910]

9. How accurate is the power draw?

A low-cost USB power meter matched lab equipment within ±1 % when measuring this bulb[Elektroda, p.kaczmarek2, post #20448864]

10. Is the bulb bright for 14 W?

At ~93 lm/W, its 1,300 lm output rivals many 100 W incandescent lamps[DOE, 2022].

11. What do Flag 24 and Flag 11 actually do?

Flag 24 enables synthetic CW channel mapping; Flag 11 switches PWM timing routine, sometimes helping dimming artifacts[Elektroda, Zain00, post #20448967]

12. Could epoxy potting shorten lifetime?

Epoxy traps heat; junction temperature may rise by 10-15 °C, cutting LED life by half in worst cases[Zhaga, 2021]—an edge case to watch.

13. Where can I buy the bulb?

The reviewed model (Moes, AliExpress item 1005003473033205) was available for US $9.49 shipped in February 2023[Elektroda, Zain00, post #20446275]

14. Is source code available to tweak PWM frequency now?

Yes. You can fork OpenBeken on GitHub and compile online with the BL602 workflow; only a few lines need editing[Elektroda, p.kaczmarek2, post #20448924]

15. What happens if I use wrong GPIO mapping?

Colors scramble or stay dark; worst case, overlapping PWM channels overheat a single LED string—a rare but reported failure[OpenBeken Wiki].

[BK7231 - CB2L] Moes LED Light Bulb 14W RGB C+W E27

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Topic summary