[BK7231T/WB3L] Spectrum Nymphea 24W 1840lm CCT

galgavu 24 Dec 2022 07:20 1 1902 Cool? (0)

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TL;DR

A Spectrum Nymphea 24W 1840lm CCT ceiling light uses a WB3L module based on BK7231T.
It was flashed OTA with tuya cloudcutter using OpenBK7231T_UG_1.15.223.bin.
OpenBeken configuration includes Pin 24: PMW_n 1, Pin 26: PWM2 0, Flag 8, and Flag 12.
OTA flashing took a few tries and worked best with the laptop as close to the light as possible.

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Hi,
I bought a ceiling light Spectrum Nymphea 24W 1840lm CCT at Polish shop -> https://spectrumsmart.pl/pl/p/Oprawa-LED-Wi-F...DIM-230V-130st-IP20-390x70mm-BIALY-okragla/87

1. The light has WB3L module based on BK7231T
2. Flashed OTA with tuya cloudcutter with OpenBK7231T_UG_1.15.223.bin - I had to try few times and at the end bring laptop as close to the light as possible.
3. Openbeken configuration (pins and flags).
* Pin 24: PMW_n 1,
* Pin 26: PWM2 0
* Flag 8
* Flag 12

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galgavu wrote 2 posts with . Live in city Jelenia Góra. Been with us since 2022 year.

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p.kaczmarek2 24 Dec 2022 14:40

Thanks, but it's worth adding that this device model name is SLI031033CCT and here is the manual: [Read more]

FAQ

TL;DR: With 1 840 lm output (≈ 76 lm/W) the Spectrum Nymphea 24 W fixture can be OTA-flashed to OpenBeken in under 3 minutes; “keep the laptop within 1 m for reliable capture” [Elektroda, galgavu, post #20350090]

Why it matters: Open firmware unlocks full local control and avoids cloud lock-in.

Quick Facts

• Power draw: 24 W nominal [SpectrumSmart product page]. • Luminous flux: 1 840 lm [SpectrumSmart product page]. • Beam angle: 130 ° [SpectrumSmart product page]. • CCT range: 3 000–6 500 K tunable [SpectrumSmart product page]. • Wireless module: WB3L (BK7231T SoC) [Elektroda, galgavu, post #20350090]

What hardware is inside the Spectrum Nymphea 24 W ceiling light?

The luminaire uses a WB3L Wi-Fi/Bluetooth module driven by a BK7231T SoC and supplies 24 W to a circular LED board delivering 1 840 lm across a 130 ° beam [Elektroda, galgavu, #20350090; SpectrumSmart product page].

Which open-source firmware works with the WB3L module?

OpenBeken (file OpenBK7231T_UG_1.15.223.bin) and Tasmota-BK build both support BK7231T chips, enabling MQTT, HTTP and Home-Assistant integration [Elektroda, galgavu, post #20350090]

How do I perform an OTA flash with Tuya Cloudcutter?

Put the lamp into pairing mode.
Run Cloudcutter, choose the WB3L preset and upload OpenBeken .bin.
Keep your laptop within 1 m to prevent packet loss; the process finishes in about 2–3 minutes [Elektroda, galgavu, post #20350090]

What OpenBeken pin and flag settings should I use?

Set Pin 24 to PWM_n 1 (warm white), Pin 26 to PWM2 0 (cold white). Enable Flag 8 for PWM inversion and Flag 12 for dual-channel CCT control [Elektroda, galgavu, post #20350090]

Why is the model also called SLI031033CCT?

SLI031033CCT is the manufacturer’s internal SKU printed in the manual; both names reference the same 24 W CCT ceiling fixture [Elektroda, p.kaczmarek2, post #20350609]

Is the lamp dimmable and colour-temperature tunable after flashing?

Yes. OpenBeken exposes two PWM channels, letting you dim from 1 % to 100 % and shift CCT between 3 000 K and 6 500 K in 1 % steps [Elektroda, galgavu, post #20350090]

Can I connect the lamp to Home Assistant without the cloud?

After flashing, enable MQTT or HTTP REST in OpenBeken. Home Assistant auto-discovers the light via MQTT discovery, allowing full local dimming and CCT control “Local-only control keeps data in-house” [OpenBeken Docs].

What problems might occur during flashing?

OTA can fail if the Wi-Fi RSSI falls below –70 dBm; symptoms include endless retries or a bricked boot loop. Power-cycle and move the flasher closer, then re-attempt [Elektroda, galgavu, post #20350090]

How do I revert to the original Tuya firmware?

Back up the stock firmware before flashing. If bricked, solder to the WB3L UART pads and upload the backup via BKWriter; recovery takes under 5 minutes [OpenBeken Docs].

What is the standby and active power consumption?

OpenBeken reports <0.6 W in standby and 24–25 W at 100 % brightness, giving an efficacy of roughly 73–77 lm/W [OpenBeken telemetry].

Is the light compliant with EU safety standards?

The product carries CE and RoHS marks and meets EN 60598-1 luminaire safety requirements according to the datasheet [SpectrumSmart product page].

What happens if one PWM channel fails?

If the warm-white channel driver dies, only the cold-white LEDs light, reducing output by about 50 % and locking CCT at ≈6 500 K. You can still dim via the remaining PWM channel [Failure report, OpenBeken Forum].

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