This is what the Ambiance Gradient Lightstrip looks like inside - Hueblog.com
Philips Hue LightStrip Plus Extension (1m) Dimmable LED Smart Light Extension (Requires Lightstrip Base and Hue Hub, Works with Alexa, HomeKit and Google Assistant) : Amazon.sg: DIY & Tools
This is what the Ambiance Gradient Lightstrip looks like inside - Hueblog.com
Flexible Corner Connector
4pin L Shape LED Corner RGB Connector IP20 LED Light Strip Solderless 90 Degree Right Angle 10mm for 5050 3528 Tape Light
Litcessory Flexible Corner Connector/Extension Cable for Philips Wiz LED Light Strips (2in, 4 Pack, White) - Amazon.com