If you bring your white shirts under an LED bulb to see how white they are, you may not be able make any distinction, a study suggests. Most LED bulbs produce no violet or ultraviolet light which help whites look “whiter than white”. While some LED bulbs will make colours pop, the vast majority do not showcase or differentiate the appearance of white products, because all white light is not the same. Whiteners that many companies use to make make whites look “whiter than white”, contain fluorescent materials that glow under violet and ultraviolet light.
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