Is control interface open? Can I make my own app (website, script) to control it?

I'm afraid this question is above my pay scale. I'm not sure what all you'd want to do beyond what is in the app but I hope you finds your answer from someone that knows more about it.

How bright is this bulb?

It all depends on the color/warmth/cool settings you choose. On some of the warmer colors it's not very bright at 100%, maybe equal to a 40 watt bulb or lower depending on color. But on the cool or coolest colors at 100% it's equal to approximately between a 60 and 75 watt bulb.

Questions & Answers: Kasa KL130 Smart Wi-Fi LED Light Bulb by TP-Link - Multicolor, Dimmable, A19, No Hub Required, Works with Alexa and Google Assistant

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Kasa KL130 Smart Wi-Fi LED Light Bulb by TP-Link - Multicolor, Dimmable, A19, No Hub Required, Works with Alexa and Google Assistant

Multicolor - With a wide range of colors and dimming capabilities, Kasa Smart's multicolor light bulb offers endless lighting possibilities. You can choose a light for everything from a dinner party to a late-night study session
No Hub Required - The Kasa Smart Wi-Fi Light Bulb, Dimmable connects to your home's secure Wi-Fi network. No need for a hub or extra equipment. All you need is your smartphone, the Kasa Smart app and a Wi-Fi connection to start controlling your bulb from anywhere
Control from Anywhere - Control your smart light bulb from anywhere with your smartphone using the free Kasa Smart app (iOS, Android). Dim, turn on or off or change the colors of your light bulb remotely at your fingertips
Voice Control - Use simple voice commands to control your Kasa Smart multicolor light bulb with any Amazon Alexa, Google Assistant or Microsoft Cortana.
NOTE: Requires a secured 2.4 GHz Wi-Fi network connection

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