REVIEW - Light strips that mount behind the tv have been around for a few years. We had the original Philips Hue light strip behind our main TV years ago.
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Lytmi Fantasy 3 TV Backlight Kit - HDMI 2.1, TV & Home Appliances, TV & Entertainment, TV Parts & Accessories on Carousell
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Sirui Ultra Slim LED Video Panel Light E30B review - The Gadgeteer
Lytmi Fantasy 3 TV Backlight Kit HDMI 2.1 with Sync Box Wi-Fi for 85~90 inch 8K 60Hz Color Lights Compatible Alexa & Google Assistant, App Control, Music RGB (Red, Green, Blue)
Lytmi Fantasy 3 TV Backlight Kit - HDMI 2.1
Jmbricklayer Glowing Pirate Ship model review - LED lights and a thematic design - The Gadgeteer
Govee Immersion Kit TV Backlight + Light Bars VS Lytmi Neo 2.0