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- calculation of the costs of fluorescent tubes and LED bars. I hope these facts will help you to decide ... lvin) and the colour rendering index (CRI) of the LED. Typically, the CCT of LEDs is between 2700 K and... y light with wavelengths larger than 700 nm. [{{:led:spectrum_413.png?400 |LED with lower CRI }}][{{:led:spectrum_412.png?400 |LED with higher CRI }}] {{c