It seems adjustable by brightness and warmth. I've seen a few photographers use it, but I can't find the words to ask amazon how much it costs. What's it called?
https://youtube.com/clip/UgkxnMWfO56IoCDCo5WsEZjuF4rGNMBN7RdK
https://youtube.com/clip/UgkxnMWfO56IoCDCo5WsEZjuF4rGNMBN7RdK
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