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KAUF A21 RGBWW Smart Bulb with ESPHome, Compatible with Tasmota, Made for Home Assistant

4.0 4.0 out of 5 stars 155 ratings

$14.99
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Item Package Quantity: 1
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Purchase options and add-ons

Brand KAUF
Light Type LED
Wattage 10 watts
Bulb Shape Size A21
Bulb Base E26

About this item

  • Five independently controllable LED channels: Red, Green, Blue, Warm White, and Cold White.
  • Runs ESPHome out of the box for 100% local control without flashing, soldering, editing YAML, or hoping tuya-convert works.
  • Connects natively to Home Assistant without going through a cloud connection or requiring a third-party App to setup or connect the bulb. ESPHome HTTP API allows use without Home Assistant.
  • Reprogrammable with other ESP8266-compatible firmwares. Easily integrates into any existing MQTT system. Compatible with Tasmota. Flashing of WLED bin files is not supported, as WLED does not support both 1MB flash and Over-the-Air flashing. Please do not try to flash a WLED bin file on these bulbs. KAUF Smart Bulb Update v1.7 adds WLED support into the stock firmware.
  • A21 bulb shape slightly larger than most standard bulbs, E26 base is typical for most US bulbs.
  • Firmware version 1.7 adds support for controlling the bulb from WLED or xLights via DDP.
  • Firmware version 1.8 adds options to adjust max power and fade length.

Additional Details

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This item: KAUF A21 RGBWW Smart Bulb with ESPHome, Compatible with Tasmota, Made for Home Assistant
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KAUF A21 RGBWW Smart Bulb with ESPHome, Compatible with Tasmota, Made for Home Assistant


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Product details

  • Package Dimensions ‏ : ‎ 5.71 x 2.91 x 2.91 inches; 3.84 ounces
  • Item model number ‏ : ‎ BLF10
  • Date First Available ‏ : ‎ August 19, 2021
  • Manufacturer ‏ : ‎ Kaufman Home Automation
  • ASIN ‏ : ‎ B09D6HR559
  • Customer Reviews:
    4.0 4.0 out of 5 stars 155 ratings

Product Description

A15 Kauf Bulb
A19 Kauf Bulb
A21 Kauf Bulb
BR30 Kauf Bulb
Customer Reviews
4.2 out of 5 stars 33
3.8 out of 5 stars 18
4.0 out of 5 stars 155
3.8 out of 5 stars 31
Price $12.99 $13.49 $14.99 $16.49
Bulb Height (mm) 86.5 129 135 135
Bulb Width (mm) 50 60 70 95
Watts 5 7 10 10
Runs Full Kauf Bulb Firmware

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KAUF A21 RGBWW Smart Bulb with ESPHome, Compatible with Tasmota, Made for Home Assistant
KAUF A21 RGBWW Smart Bulb with ESPHome, Compatible with Tasmota, Made for Home Assistant
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Lightinginside Smart Light Bulbs 100W Equivalent, 1350LM 11W WiFi Smart Bulb Compatible with Alexa/Google Assistant/Smart Life, A19 E26 RGBCW Color Changing, No Hub Required,2.4G WiFi, ETL Listed,4PCS
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Customer reviews

4 out of 5 stars
155 global ratings

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Customers say

Customers find the light bulb's functionality, ease of setup, reliability, and integration with Home Assistant to be positive. They describe it as a great smart bulb that works well without a cloud connection. Many customers find it a good value for money. However, some have issues with lifespan, brightness, and WiFi connectivity.

AI-generated from the text of customer reviews

44 customers mention "Functionality"32 positive12 negative

Customers like the functionality of the light bulb. It works well with ESPHome and Home Assistant, and connects easily to their servers. They say it's a great solution if you don't want to invest in out-of-band options. The bulb functions as a standard LED bulb when not in use and runs ESPHome, providing additional settings.

"This WiFi smart bulb is perfect for my application. I'm using three of them in shielded outdoor home lamp fixtures...." Read more

"...They work brilliantly with Home Assistant and ESPHome...." Read more

"...It runs ESPHome so there are a ton more settings you can configure, the instructions say that it supports Tasmota firmware or any Esp8266 firmware..." Read more

"...I don't run them hard. They're usually only on for a few hours a day, never at 100%..." Read more

32 customers mention "Ease of setup"32 positive0 negative

Customers find the light bulb easy to set up and use. They mention it's simple to configure with Home Assistant, with ESPHome pre-installed. The documentation and configurations are well-written, and the bulbs connect easily to the network. The designer has helpful tutorial videos on YouTube.

"...They integrate perfectly with Home Assistant and were a breeze to configure. Their reliability with my older ASUS access point has been flawless...." Read more

"...The designer is friendly and has great tutorial videos on his youtube channel. Great bulbs. Will continue to buy these as I need them." Read more

"...It wouldn't be so bad if repairing it was easy. Getting it apart was easy for the top part but the location of the bad bulging capacitor was almost..." Read more

"...Assistant will recognize that a new device was installed and prompt you to set it up...." Read more

27 customers mention "Bulb reliability"22 positive5 negative

Customers appreciate the bulb's reliability. They find it works well without a cloud connection, is great for home automation, and has a simple programming interface. The quality is good, and the bulbs are easy to program.

"...Their reliability with my older ASUS access point has been flawless. Highly recommend these." Read more

"...Great bulbs. Will continue to buy these as I need them." Read more

"...BEST SMART BULB! Worked perfect in my setup right out of the box and WITHOUT any online servers who could data mine or collect my information!..." Read more

"...Previous review: Excellent bulbs. They connect no issue. I was able to find and modify the configuration to suite my needs...." Read more

20 customers mention "Integration"17 positive3 negative

Customers appreciate the light bulb's integration with Home Assistant. They find it perfect for home automation, with a simple design and great support. The bulb is compatible with Home Assistant and automatically discovered by the software. Customers are able to add it to integrations and control all aspects of brightness and color.

"...They integrate perfectly with Home Assistant and were a breeze to configure. Their reliability with my older ASUS access point has been flawless...." Read more

"...I am able to add it to integrations and control all aspects of it, brightness, color temperature of white light, and change its color to anything I..." Read more

"finally! a bulb that is compatible with home assistant but also supports wled/ddp, I was able to make it integrate with ha and hyperionng so I have..." Read more

"...Ideal for DIY home automation." Read more

14 customers mention "Value for money"11 positive3 negative

Customers appreciate the value for money of this light bulb. They say it has good performance at a fraction of the cost, is worth it for convenience, and is a good choice if you don't want to be dependent on the cloud.

"...security hole nightmares that come from the big-box stores, they're worth it...." Read more

"...to include some kind of component in them, apparently at a reasonable cost, which fits the form factor of a light bulb, that prevents them from..." Read more

"...All in all, they have Hue performance for a fraction of the cost. They have Tuya/Smart Life ease of use, without being in the cloud...." Read more

"No complaints! It's a great product." Read more

34 customers mention "Brightness"22 positive12 negative

Customers have mixed reviews about the brightness of the light bulb. Some find the whites bright and colors better than other smart bulbs they've used. They say it looks like Hue lighting, is rated for outside use, and dim smoothly to very low lux levels. However, others mention that the warmest color temperature is still extremely blueish compared to TP-Links, the "warm white" is purplish, and the cool white is excessively blue. There are also complaints that the bulb is not as bright as the Novotella bulb it is meant to replace, and the warm W LED is just a bit too cool for their liking.

"...There is zero flicker and the bulbs dim smoothly to very low lux levels...." Read more

"...I love the brightness and the ability to control the warmth of the white light. They work brilliantly with Home Assistant and ESPHome...." Read more

"...Snappy response & easy to pair. The warm W LED is just a bit too cool for my liking. Wish it went to 2700k instead of 2850k...." Read more

"...lets me turn the bulb on and off, change the brightness, change the color temperature (how blue/white or yellow the light is), and also change the..." Read more

12 customers mention "Wifi connectivity"5 positive7 negative

Customers have different experiences with the WiFi connectivity of the light bulb. Some say it integrates seamlessly into their network and has no connection issues. Others report issues like flickering, difficulty connecting to local Wi-Fi, and problems with MQTT connectivity.

"...for home automation, smart devices, and WiFi connected everything is flooded with absolute crap...." Read more

"...the initial connection and firmware update there have been no connection issues...." Read more

"...I did have a little trouble adding it to HA, getting 401 Unauthorized errors connecting to MQTT, but that was my fault, it was due to the modified..." Read more

"...Previous review: Excellent bulbs. They connect no issue. I was able to find and modify the configuration to suite my needs...." Read more

15 customers mention "Lifespan"0 positive15 negative

Customers are unhappy with the light bulb's lifespan. They report that it dies within a year of use, even after just 8 hours of being on. The power supplies and bulbs fail, and they don't handle power outages well. There are also reports of poor design, planning, and maintenance issues.

"...Bulbs. WILL. Die. Period. Every single one I've had has died within one single year of use. I don't run them hard...." Read more

"...early in their life cycle due to bad design, poor planning, failure to maintain/update, etc...." Read more

"...My bulb died after 8 hours off being on. It was at partial brightness: 1,0.68,0.25,0,1 RGBWW. The pwm was capped at 85 percent...." Read more

"...the bulbs do not turn on, still likely indicative of a power supply capacitor failure." Read more

5+ stars.
5 out of 5 stars
5+ stars.
This WiFi smart bulb is perfect for my application. I'm using three of them in shielded outdoor home lamp fixtures. There is zero flicker and the bulbs dim smoothly to very low lux levels. Their RGB capabilities probably fall short of some other bulbs but I use them with a warm white temperature and they look fantastic. They integrate perfectly with Home Assistant and were a breeze to configure. Their reliability with my older ASUS access point has been flawless. Highly recommend these.
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Top reviews from the United States

  • Reviewed in the United States on December 3, 2024
    Item Package Quantity: 4Verified Purchase
    This WiFi smart bulb is perfect for my application. I'm using three of them in shielded outdoor home lamp fixtures. There is zero flicker and the bulbs dim smoothly to very low lux levels. Their RGB capabilities probably fall short of some other bulbs but I use them with a warm white temperature and they look fantastic. They integrate perfectly with Home Assistant and were a breeze to configure. Their reliability with my older ASUS access point has been flawless. Highly recommend these.
    Customer image
    mac
    5.0 out of 5 stars
    5+ stars.

    Reviewed in the United States on December 3, 2024
    This WiFi smart bulb is perfect for my application. I'm using three of them in shielded outdoor home lamp fixtures. There is zero flicker and the bulbs dim smoothly to very low lux levels. Their RGB capabilities probably fall short of some other bulbs but I use them with a warm white temperature and they look fantastic. They integrate perfectly with Home Assistant and were a breeze to configure. Their reliability with my older ASUS access point has been flawless. Highly recommend these.
    Images in this review
    Customer image
    One person found this helpful
    Report
  • Reviewed in the United States on February 15, 2023
    Item Package Quantity: 4Verified Purchase
    I've replaced nearly every bulb in my house with these, and while they're more expensive than the security hole nightmares that come from the big-box stores, they're worth it.

    I love that they only talk to my server and aren't "calling home" to a server in another country with my wifi credentials.

    Yes, it is more effort to setup, but that's the price you pay to protect your privacy and not have to worry about some service provider deciding to stop supporting their servers/bulbs.

    The only issues I've had getting them connected was with a few bulbs that had older firmware and wouldn't take the initial wifi connection until I turned off my second wifi access point. (I've had this issue with Amazon Echo Dots too.) After the initial connection and firmware update there have been no connection issues.

    I love the brightness and the ability to control the warmth of the white light. They work brilliantly with Home Assistant and ESPHome. The ability to set a default state when power is lost and brought back is really nice too.

    The designer is friendly and has great tutorial videos on his youtube channel.

    Great bulbs. Will continue to buy these as I need them.
    2 people found this helpful
    Report
  • Reviewed in the United States on November 15, 2024
    Item Package Quantity: 4Verified Purchase
    As an advocate for running your smart home devices ONLY on a locally hosted server, I want so bad to love these bulbs, because there really isn't an available alternative to smart light bulbs that work natively with Home Assistant. But unfortunately, here I am leaving a 1 star review that will read very similarly to the others:

    The power supply on these bulbs are horrible. They are advertised as 10W bulbs, and they WILL meet that with light output, yet the person who makes them openly says they should not be run at 100%, insisting on keeping them at 80% or lower to avoid them burning out. Don't put them in enclosed fixtures that will trap heat, they'll tell you. Don't leave them on all the time. Don't this and that to avoid the lightbulb dying..

    Let me tell you: These. Bulbs. WILL. Die. Period. Every single one I've had has died within one single year of use. I don't run them hard. They're usually only on for a few hours a day, never at 100% (There's actually a setting in the bulbs firmware that lets you set a maximum output percentage. After the first couple deaths, I have had this set to 70%, so keep in mind that means when the bulb is set to 100% in home assistant, it's ACTUALLY only at 70% output). NONE of them are in enclosed fixtures, the fixture in my bedroom is even open at the top and vented at the bottom, and my latest fresh bulb in it lasted only THREE MONTHS! I've had one that just died outright and would never take power again, and three more that slowly degraded over time, developing a flicker and only pulling ~2W of power when set to 100%

    If you go looking around for people having problems with these bulbs, you will inevitably find people who tell you that if you email the maker of the bulbs, he will send you replacements free of charge.. which is very nice, I won't disparage him for that at all. This is something that I have already had to do in the past, the email exchange with him was painless and he sent me replacements for the failed bulbs. I tried to press for clarifications on just how much to limit these bulbs to not have them fail prematurely, and he stood by the 80% limit. I took that and set the limit to 70% and they STILL DIE. Getting free replacements is cool and all, but I don't want to be stuck in this perpetual cycle of replacing garbage with garbage.
    3 people found this helpful
    Report
  • Reviewed in the United States on September 15, 2021
    Item Package Quantity: 1Verified Purchase
    My initial impressions are that this smart bulb is amazing! It worked perfectly out of the box. I installed the bulb in a light fixture and turned the switch on and it light up. I used my phone and connected to the WiFi network that it started broadcasting, opened a web browser and typed in the address that the instructions gave. I was given a list of wifi networks it detected, I clicked on mine and put in the password. The bulb "rebooted" and connected to my network and my phone switched back I opened Home Assistant and it said it found a new device. I clicked add and it connected and lets me turn the bulb on and off, change the brightness, change the color temperature (how blue/white or yellow the light is), and also change the color to different colors such as red, green blue, purple ext.. all with the only configuration was connecting it to my WiFi then clicking add in home assistant!

    It runs ESPHome so there are a ton more settings you can configure, the instructions say that it supports Tasmota firmware or any Esp8266 firmware and tells you which GPIO pins are connected to what colors so you can set that is needed in new firmware.

    BEST SMART BULB! Worked perfect in my setup right out of the box and WITHOUT any online servers who could data mine or collect my information! This bulb is flexible enough that it could be configure to work with other online systems.
    One person found this helpful
    Report