Seoul Semiconductor

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Seoul Semiconductor Co., Ltd. is a Korean company that produces LEDs. Their P4 and P7 LEDs were used in a number of flashlights though these are fairly old and do not appear to have been updated.


The P4 uses Cree's EZ1000 die and has similar performance to the Cree XR-E LED. Do not confuse the Cree P4 bin (brightness) with the SSC P4 LED. The SSC P4 LED was much used as a "drop in" replacement for Lumileds Luxeon 3 LEDs. It gave about twice the output for about three times as long on the same battery and driver as a Luxeon 3. It had the same die height and beam pattern as the Luxeon 3 which the then new Cree LEDs did not.

P4 web page

Seoul Semiconductor P4 Brightness Bins
Max bin available is U2
Bin 350mA 1000mA
S1 54-60 127-141
S2 60-70 141-165
T1 70-80 165-188
T2 80-91 188-214
U1 91-100 214-235
U2* 100-109 235-256
U3 109-119 256-280


The P7 is a multi-die LED utilizing four P4 LEDs. P7 LEDs have bin names that indicate brightness, color tint, and forward voltage. For instance a DSXOI bin indicates brightness level D, color SXO, and forward voltage of I. P7 web page

Brightness: Usually C or D where C is 700-800 lumens and D is 800-900 lumens (measured at 2.8 amps), but really there is some overlap where a low-end D might be less bright than a high-end C.

Color: A common cool white color bin is SXO (6700K), while SWO is not as cool (6050K), and SVN is almost neutral (5350K). See chart below for all of the SSC tint bins and color temperatures, though not all bins on the chart are actually available.

Forward voltage: I and J are common. I is 3.25-3.50V and J is 3.50-3.75V, again with some overlap possible.

The dies are manufactured for SSC by Cree, but the phosphor is SSC's own. Many prefer the P7 to the Cree MC-E which has the same dies but different phosphors and optics.

Seoul Semiconductor P7
Max bin available is D
Bin 1400mA 2800mA
A 251-326 440-570
B 326-400 570-700
C 400-457 700-800
D* 457-514 800-900
E 514-629 900-1100

Tint bins

SSC's tint bins
SSC does not use the ANSI White standard, but comparisons can still be made by using the color temperatures shown on the chart at the right. The bins used here only cover the first 3 or 4 cooler white quadrangles of ANSI White. For more information on binning see the Binning and Labeling guides available at the product links listed above.