YUJILEDS - Your trusted LED PCB partner.

YUJILEDS commence customization of LED spectrum and PCB manufacturing from 2013 and is specialized in serving applications that have specific demands for light quality such as in photography lighting, horticulture lighting, color inspection. With deep understanding of optical-electrical characteristics, industrial experience and manufacturing skills, YUJILEDS is committed to bringing customer satisfaction by providing high quality LED PCB manufacturing and assembly services.

NEW CUSTOM PCB BUSINESS

In 2020, Yuji start to establish a brand new CUSTOM PCB business structure. In this business, Yuji will give all-round support to customers from following four aspects.

Our strength

PHOSPHOR

Nakamura Yuji, one of the subsidiaries of the Yuji Group, is a joint venture with investment from Mitsubishi Chemical to develop and produce best quality LED phosphors. Nowadays Yuji is one of the very few LED companies in the world that has more than 93 phosphors manufacturing capabilities. Yuji has the top spectrum simulation technology based on its LED phosphors expertise.

LED CHIP

In PCB assembly, the light source will not only be limited to the LED manufactured by Yuji. According to the needs of customers, Yuji light source and light sources from other brands can be integrated to provide high performance and more suitable solutions for customers.

YUJI LIGHT CONTROL TECH

In PCB business, Yuji will completely focus on the performance of light in the entire board rather than a single LED. Based on Yuji LIGHT CONTROL TECH, the light quality of a whole board could be more accurate than a single LED.

MANUFACTURING

In PCB manufacturing, Yuji owned its phosphor factory, LED factory, SMT factory and have contracted with PCB factories to provide customers with high quality LED boards with strict standards of production and quality control.

HOW TO MAKE A LED PCB

STEPS to easily make PCBs. Customers will only need to determine the specs and our team will assist you with the rest.

PRODUCTION PERIOD

The total period from inquiry to delivery will take 3-6 weeks, which depends on the specialty and difficulty of the PCB design.

3-7 days

Circuit drawing & designing

7-14 days

PCB boards / LEDs manufacturing

3-7 days

SMT

3-7 days

Testing & packaging & transporting

HELPFUL TIPS ON EACH STEP
OF MAKING A LED BOARD

Determine LED/PCB specs - early stage preparation

Dimensions

The cost of a PCB is related to the board utilization, which cannot be defined by a proportional coefficient. For example, the dimensions of an original PCB substrate are 1200*1000mm, which can make 4pcs of 600*500mm board. Yet if it is a 610*500mm board, an original PCB can only make 3pcs, which means the cost is increased by 30% but the surface area is only increased by 1.6%.

Heat radiating grooves and vent holes are used for LED panels without heat sinks on the back. The aim is to improve the effect of heat dissipation by increasing the number of grooves.

V-scoring is used consistently in printed circuit board assembly because it is a great cost saver and a highly efficient way to offer easy separation of parts from a completed assembly.

PCB substrates

1) MCPCB

Thermal conductivity (W/(m*K)): 1.0 2.0 3.0
Thickness (mm): 1.0 1.5 2.0
Aluminum based PCB: a common PCB substrate type.

2) FR-4

TG value (℃): 135 170 190
Thickness (mm): 0.4 0.6 0.8 1.0 1.5 2.0 3.0
Fiberglass board: thinner and lighter than MCPCB, heat dissipation performance is lower than MCPCB.

3) FPCB

Flexible PCB, substrate of LED strip.

4) Thermal-electric separation of cooper substrate

It is suitable for high power LED chip that has separated pad and circuit such as CREE-XPE.

Electrical characteristics

The driving mode of an LED panel can be constant voltage(V) or current(I), which depends on your power supply mode.

Electrodes, connectors and electronic components

Soldering paste can be applied on electrodes for easily soldering. Alternatively, Wago connectors can be either mounted on electrodes for no soldering installation.
QC and testing - exFactory

Test items

1) Inspection - Appearance

2) Optical-electrical test - CCT accuracy

- CRI R1-R15
- Luminous flux
- Power driving
Request for PCB quote