YUJILEDS® releases IP65 IP67 high CRI LED flexible strip

LED soft ribbon is getting popular due to its flexibility, and YUJILEDS® also offers flexible ribbon based on its remarkable color reproduction quality. With the increasement of different applications, special environments are required for using the LED ribbons, then water-tightness and dust-tightness are necessary sometimes.

It is easy to find IP rating LED ribbons on the market, however as our research, most products are for common lighting applications, which means people do not pay attention on the lighting quality too much. After trying the experiments on high CRI + IP LED strips, we find that the spectrum shifts seriously after the protection coating, while this is unacceptable for our customers who are always strict at the color accuracy. 

	Before coating	After coating
Spectrum
CCT	3220K	3955K
CIE 1931 coordinate	x = 0.4232, y = 0.4011	x = 0.3859, y = 0.3904
DUV	0.0009031	0.00471

Figure 1 – YUJILEDS® nominal 3200K LED, before and after coating with common protection material.

	Before coating	After coating
Spectrum
CCT	5741K	9681K
CIE 1931 coordinate	x = 0.3271, y = 0.3376	x = 0.2835, y = 0.2833
DUV	0.0006173	-0.00181

Figure 2 – YUJILEDS® nominal 5600K LED, before and after coating with common protection material.

After the investigation we realize that the organic material of the protection coating is sensitive to the 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 to use 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 spectrum power distribution and it does not equal to absolutely accurate color, what we are always doing is to simulate the spectrum as close to blackbody radiant as possible, furthermore the affect 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 own development and now it is excited to announce the YUJILEDS® IP65/67 flexible strip is released formally!

 What we have done is finding 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® 3^rd generation chromaticity bin which means we will process even better consistency control on this strip (more information about 3^rd generation bin please refer to “Less is more - YUJILEDS® releases its 3^rd generation of chromaticity bin”).

	YUJILEDS® IP65 2700K	YUJILEDS® IP65 5600K	YUJILEDS® IP67 2700K	YUJILEDS® IP67 5600K
Spectrum
CCT	2640K	5590K	2651K	5582K
CIE 1931 coordinate	x = 0.4627 y = 0.4080	x = 0.3350 y = 0.3358	x = 0.4623 y = 0.4085	x = 0.3306 y = 0.3361
DUV	-0.0012	-0.00184	-0.000961	-0.00171
CRI	97	95.7	97.1	95.7

Figure 3 – YUJILEDS® IP65 / IP67 flexible strip, coating with customized protection material.

Regardless any type of the product, the color quality and accuracy are always our ultimate pursuits.