The collection of spectra leds.mspct contains spectra for light
emitting diodes (LEDs) from several different suppliers. The character
vectors described here contain the names of the spectra for LEDs from each
supplier/brand to facilitate their extraction from the collection. One
additional vector, led_brands contains the names of the brands as used
in the names of the spectra in the collection.
Usage
led_brands
Agilent_leds
HueyJann_leds
LedEngin_leds
Ledguhon_leds
LCFOCUS_leds
Marktech_leds
CREE_leds
Epileds_leds
Epistar_leds
SeoulSemicon_leds
Bridgelux_leds
Nichia_leds
Norlux_leds
Osram_leds
QuantumDevices_leds
Roithner_leds
Weili_leds
TaoYuan_leds
Luminus_leds
Samsung_leds
HotRed_ledsFormat
A vector of character strings.
An object of class character of length 7.
An object of class character of length 2.
An object of class character of length 14.
An object of class character of length 2.
An object of class character of length 4.
An object of class character of length 1.
An object of class character of length 1.
An object of class character of length 12.
An object of class character of length 1.
An object of class character of length 3.
An object of class character of length 2.
An object of class character of length 9.
An object of class character of length 3.
An object of class character of length 3.
An object of class character of length 4.
An object of class character of length 15.
An object of class character of length 5.
An object of class character of length 1.
An object of class character of length 1.
An object of class character of length 1.
An object of class character of length 4.
Details
As described for the individual brands, ownership of brands and companies has changed over the years through take-overs, mergers and sales of company divisions. Even when brand names have changed it has been the norm for electronic components that component type codes are maintained unchanged. In contrast to some integrated circuits, exact replacement types from multiple suppliers are not available for LEDs.
Some small suppliers sell under their own brand names, rarely with type codes, LEDs that seem to be based on out-of-specifications LED chips. Some are plain bad, such with low output, but others emit at wavelengths that are not otherwise available, at least in small numbers.
Agilent/Hewlett Packard
Hewlett Packard (HP) manufactured sold LEDs in the 1990's. This division later became part of Agilent, during its spin-off HP. Later the electronic components division of Agilent operated as Avago Technologies for some time. Currently, BROADCOM supplies some of these LEDs or similar improved types.
Huey Jann
Huey Jann was a Taiwanese supplier of high power LED arrays. The arrays measured were bought from their European distributors. Huey Jann is no longer in business.
LED Engin
Led Engin was an independent supplier of power LEDs in low thermal resistance ceramic substrate packages. It is now part of Osram.
LEDGUHON
LEDGUHON (AliExpress seller) advertised the LEDs measured as assembled using Bridgelux chips by Guangzhou Juhong Optoelectronics Co., Ltd., China.
LCFOCUS
LCFOCUS TECH (Shenzhen, China) sell LEDs and LED arrays. The ones measured where bought from LCFOCUS official store at AliExpress. The suppliers of LED chips are not allways informed.
Marktech
Marktech Optoelectronics is a distributor and supplier of LEDs from the U.S.A. that sells VIS and UV emitting LEDs.
Epileds
EPI LEDS Co., Ltd. (Taiwan) is devoted to the R & D, design, manufacture and sales of blue, green, red, and white light LED wafers and chips.
Seoul Semiconductors
Seoul Semiconductor (Korea) supplies LEDs, including SunLike white LEDs using 'phosphor' technology from Toshiba (Japan). Seoul Viosys supplies UV LEDs based on an agreement with SETi (U.S.A.).
Bridgelux
Bridgelux, Inc. (U.S.A.) is a supplier of LEDs partnering with Epistar and Kaistar for the manufacture of their LEDs.
Nichia
With 24 in the world and inventor of the blue (and also white) light emitting diodes. The company was already an important supplier of 'phosphors' before the invention of the white LEDs based on blue-emitting LED chips.
Some of the Nichia LEDs we measured were assembled into arrays of the series names SmartArray and LinearZ from LUMITRONIX (Germany), and/or supplied by LEDRISE Ltd. (Hong Kong, Germany and Romania).
Norlux
Norlux is now part of Thomas Research Products. The LEDs we measured are some of the earliest COB designs from early 1990's. Each COB containing 90 LED chips. (Norlux is no longer in business.)
Osram
ams-OSRAM International GmbH (Germany) produces LEDS and various light and other sensors. Current trade name for LEDs is Osram Opto Semiconductors. Osram has recently become owner of Led Engin, whose LEDs are listed separately in this pacakge. LEDs supplied under the LED Engin brand differ mostly in the packages' thermal properties and contact layout.
Quantum Devices
Quantum Devices (U.S.A.) sold in the past both individual LEDs and luminaires. They were in the late 1980's and early 1990's the supplier of choice for LEDs emitting in the far-red region of the spectrum. The company still exists but no longer sells LEDs as components.
Roithner LaserTechnik
Roithner LaserTechnik is a distributor and reseller of LEDs, LED arrays and lasers. They have a very extensive catalogue covering almost all wavelengths for which LEDs are manufactured. Many of the LEDs are sold under new codes as they are retested and in some cases individual characterization data provided. For example some of short UV LEDs sold are from SETi.
Shenzhen Weili
Leds Global and Shenzhen Weili are trade names of the same supplier of LEDs and LED arrays. They sell both standard types and also assemble customized arrays upon request. Customized arrays may have up to twelve independent channels and vary in power output from 10 W to 300 W. The LED chips they use are from multiple suppliers, including Epileds, Epistar and Bridgelux.
Hot Red
Hot Red (AliExpress, China) is a seller of LEDs and LED arrays, most as components. Original manufacturers and item types in most cases are not published.
References
https://www.broadcom.com/products/leds-and-displays/
https://www.osram.us/ledengin/
https://www.epileds.com.tw/en/
http://www.seoulsemicon.com/en/
https://www.bridgelux.com/bridgleux
https://www.nichia.co.jp/en/product/led.html
Examples
led_brands
#> [1] "Agilent" "Bridgelux" "CREE" "Epileds"
#> [5] "Epistar" "HotRed" "HueyJann" "LCFOCUS"
#> [9] "LedEngin" "Ledguhon" "Luminus" "Marktech"
#> [13] "Nichia" "Norlux" "Osram" "QuantumDevices"
#> [17] "Roithner" "Samsung" "SeoulSemicon" "TaoYuan"
#> [21] "Weili"
Agilent_leds
#> [1] "Agilent_HLMB_CB30" "Agilent_HLMB_CD31" "Agilent_HLMP_CB31"
#> [4] "Agilent_HLMP_CM30" "Agilent_HLMP_CM31" "Agilent_HLMP_DJ32"
#> [7] "Agilent_HLMP_DL32"