After the investigation, we realize that the organic material of the protective coating is sensitive to light, and this results in the phenomenon of spectrum shift. One method comes up to us that assuming 3200K CCT would shift to 4000K, then how about using the 3200K ribbon as 4000K directly after the coating? But this is rejected immediately since we understand the CCT is only a calculated number from the spectral power distribution and it does not equal accurate color, what we are always doing is to simulate the spectrum as close to blackbody radiant as possible, furthermore, the effect from the coating presents unstable shift tendency, it is can be found from the CIE 1931 coordinate and DUV data from Figure 1 and 2. In this case, we start our development and now it is excited to announce the YUJILEDS® IP65/67 flexible strip is released formally!

What we have done is find out the spectrum shift theory on the coating material, then process the technical control to make the shift stable and consistent; on the LED part, a special spectrum is customized to match the shift, then the eventual result is no difference comparing to our general high CRI LED strip, although the LED inside the coating is no longer the original high CRI spectrum. Figure 3 shows the typical test data of YUJILEDS® IP65 / IP67 high CRI flexible strip, and it comes with YUJILEDS® 3rd generation chromaticity bin which means we will process even better consistency control on this strip (more information about 3rd generation bin please refer to “Less is more – YUJILEDS® releases its 3rd generation of chromaticity bin”).