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There is no listed Brightness level in nits of Candelas per square meter (cd/m²) listed for the LG 75" Class 70A Series QNED AI 4K UHD Smart webOS TV (2025), Model # 75QNED70AUC. The decision for TV manufacturers to stop listing brightness specifications (in nits) is attributed to the complexity and variability of TV technology. Brightness is one of many factors that contribute to a TV's overall performance, and manufacturers may not want to oversimplify the product's capabilities. Additionally, the use of different measurement methods across brands can lead to confusion and make it difficult for consumers to compare products accurately. Brightness in today’s TVs means something very different than it did just nine or 10 years ago. That’s because in 2014 we started getting HDR — or high dynamic range — in both our TVs and the video itself, thus changing dramatically how brightness was used by a TV. Before we had HDR, we made do with standard dynamic range (SDR). The SDR standard was developed around the aging cathode ray tube in CRT TVs. What most TVs did was to just sort of raise the roof. So they would map out all the tones from 0.1 to 100 across a much broader range, let’s say, from 0.1 all the way up to 700. This meant that the brightest elements of the picture would be put out at 700 nits, while something that was coded for 80 nits might come in at 450, and so on. They just moved the scale. And this allowed us to have what we call high APL, or average picture level, even though SDR’s maximum information for brightness was pretty low. Now we can include information in a video signal that goes from 0.1 all the way up to 1,000, or 4,000. And if Dolby Vision had its way, it would go all the way up to 10,000 nits. HDR kind of flipped the script on what brightness meant for a TV and its viewer. In the early days of HDR, most TVs could not get as bright as the information in the video signal, so instead of tone-mapping everything up, they had to tone it down to the operable range of the TV. Most HDR is mastered up to 1,000 nits — sometimes up to 4,000. but that is rare. In many cases, HDR TVs can put out more brightness than the video signal calls for. The brighter the room, the more brightness you want from your TV so that the picture can still look like it has great contrast. This brings back the APL, or average picture level, with which a TV can just make everything it displays brighter for you so it is easier to see. APL defines in simple terms how much of the image you’re displaying is bright, and how much of it is dark. A simple measurement approach you will see in reviews is when the brightness of different sized white windows as measured against a black background. When the white box is a quarter of the size of the overall image this simulates a 25% APL. Half the screen would be 50% APL, and a full white screen would be 100% APL. And so on. Smaller sized windows like 1% and 5% APL simulate small highlights areas as well...^Ivan.
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