LED FAQ
Frequently asked questions and answers on LED's (Light Emitting Diodes)
http://www.pioneernet.net/optoeng/LED_FAQ.html

Quantum Devices, Inc.
The Quantum Devices product lne includes application specific Silicon Photodiodes, Optical Encoders and Light Emitting Diodes (LED) for commercial, industrial and medical applications. QDI's photodiodes and LED's are used in instrumentation for photosynthesis and photobiological research, biomedical and medical instrumentation for measuring blood sugar levels (glucometer), oxyhemoglobin and pulse rate (pulse oxymeter).
http://www.quantumdev.com/

Jiann Wa Electronics Co., Ltd.
Manufacturer of LED lamp, polyester film capacitor
http://www.jiannwa.com.tw/

For The Love of LEDs
The LED Museum. A site devoted to testing & reviews of LEDs & LED flashlights in all common chemistries. Includes test target illumination photos of many LED samples, LED museum, and LED flashlight abuse.
http://ledmuseum.home.att.net/

Invac
Manufacture a range of leaded and surface mount diodes. Including fast/Schottky diodes, transient voltage suppression diodes, fixed voltage diodes and rectifier diodes.
http://www.invac.com/

Ledyoung Technology Corporation
Opto-electronic component manufacturer has it 16*16 high resolution DOT matrix display, many kind of back lighting for LCD modale.;¥»¤½¥q¬°¤@±M·~¼Æ¦rÅã¥Ü¾¹,ÂI°}Åã¥Ü¾¹,­I¥úªO,±m¦â¤â¾÷¥Î­I¥ú·½, µo¥úºÞ,¤é¥ú«¬¶H¯ÀºÞ»s³y¼t.
http://www.ledyoung.com.tw

Naina Semiconductor Ltd.
Manufacturers of rectifier diodes, schottky diodes, power diodes, modules, thyristors and bridge rectifiers. From India.
http://www.nainasemi.com

Khandelwal Herrmann Electronics Limited
Manufacturers of diodes, power diodes, bridges, hv diodes, thyristors, triacs, power transistors, mosfets, puk/capsules.
http://khelelectronics.com/

Oki Digital Imaging Corporation
Develops and manufactures light emitting diode array chip and LED print-head, which are the key parts of printers and facsimiles.
http://www.odij.co.jp/indexe.html

CDT Ltd.
Cambridge Display Technology is the leader in the development and application of light emitting polymer technology
http://www.cdtltd.co.uk/