In the most cases, several LEDs will be designed to work in series. Drive current for these LEDs is the same, but forward voltage for each LED is not. For example, the forward voltage of standard white 2835 LED in the market is generally ranged in 2.8 ~ 3.4 V at rated 60mA current. Therefore, a maximum 21% difference on power consumption of each LED will be generated if no consideration on voltage bin of the LED. This design will reduce the long-term stability of the LED PCB. Forward voltage bins and LED drive current can be difficult to manage in production. Whether you would like to implement a constant voltage or constant current topology, or are not sure, we can help. We handle current limiting resistor specification pairing, so that you can simply specify a constant voltage level and desired current draw. We ensure that each of our 0.1V bin-range LEDs will be used in a single panel or product, and ensure all of LEDs in a panel work at the same operating environment. This will greatly improve the long-term stability of the light fixture.

Based on preliminary information regarding expected ambient temperatures and required light output, we can provide recommendations on appropriate board materials, LED density, drive current and any heatsinking requirements. Once working prototypes have been built, we can provide ISTMT in situ temperature measurement test case and solder point temperature measurements, and provide TM-21 lifetime projections based on third-party LM80 test data that have been completed for our LEDs.

Looking for a high CRI, warm-white / daylight-white tunable circuit board design? Looking to maximize on lumens per dollar? Wondering if your LED density is sufficient, or if it might cause “spotting?” Need 1500 lumens per foot? Need 100 lumens per foot? We have you covered. Our experienced engineering team can provide recommendations and quickly provide schematic and design charts to optimize based on your requirements. We also have a variety of connector and other components to help integrate into power supply systems

Variation in LED chromaticity is sometimes a difficult issue. We recommend diagonal binning, which can reduce chromaticity variations to 50% - e.g. 2700K +/- 150K to 2700K +/- 75K, simply via strategic placement of SMD LEDs on a PCB. Rather than taking on the task of additional inventory and multiple reel variants per LED type, why not let us take care of this for you?

Light come from your fixture is a mixed light between direct transmission light and indirect transmission light. Generally, the color indirect transmission light is slightly different from direct transmission light due to inconsistent absorption characteristic against wavelength of the soldermask of the PCB board. Therefore, if you need the accurate light from the fixture, the absorption characteristic of the PCB board, even diffuser must be considered. With YUJI’s professional custom spectrum technology, we can easily help you to improve the color accuracy at LED level avoiding the work of finding right PCB board or diffuser.