Oct 14, 2026
Why we publish color rendering data for every light bar
Most lighting listings show lumens and nothing else. Lumens tell you how bright a room gets — CRI tells you whether the food on the counter still looks like food.
Lumens are the easy number. They measure how much light leaves a fixture, and they are what every marketplace listing leads with. What they do not tell you is whether a red pepper reads red or washed-out orange under that light.
That is color rendering, measured as CRI (and more usefully now, TM-30). A cheap white LED can hit 400 lumens at CRI 80 and make a bowl of tomatoes look grey. Our bars are specified at CRI 92, and each production batch is measured in our Zhongshan lab on an integrating sphere.
Starting this month, every Glowline box carries a QR code that opens the photometry report for that batch: lumen output, CRI, R9 (the deep red value that most manufacturers quietly omit), color temperature and flicker modulation.
We are not publishing these numbers because they are flattering. R9 on a 2700K LED is hard to get above 60 without cost, and ours sits at 68. We publish them because a spec you cannot verify is a marketing claim, not an engineering one.
If you are comparing light bars and a listing shows only lumens, ask for the batch report. Any manufacturer with a test lab can produce one in an afternoon.
— DWEPTU product team
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