2025-10-29
- Type: multi-die
- Bin: unknown
- Color group: — (6500 K)
- CRI: 70
For further information on the emitter, please refer to [the detailed test](URL zum Test) that has already been carried out.
This emitter was kindly provided to me by BLF user @billy_s. Many thanks for that! I do not have any further information or a data sheet for this LED.
The ChangDa SFP55 is a 25-chip variant of the SFH55, which has already been tested. The “P” in the type designation refers to the 25-chip variant (“H” = 16 chips). Like the SFH55, the chips are mounted on a gray ceramic substrate and covered with a clear silicone layer, under which the yellowish phosphor is located. The chips were probably manufactured by AoYang, which are generally said to have lower efficiency and, above all, overcurrent capability.
The LED measures 11 x 11 mm. This size is usually referred to as “110110,” occasionally (especially on the prints of the MCPCB) as “XHP110.”
- Maximum reached at 60 A, at this point 14393 lm @ 3.27 V
- Power at maximum 196.4 W
- Efficiency at maximum 73.3 lm/W
Data for 25 °C Tsp (at 85 °C the luminance values are around 13 % lower).
My 60 A power supply was maxed out, which is why the curve ends quite abruptly. The maximum possible operating current should be between 65 and 68 A.
Since the flux binning of the SFP55 (and all other ChangDa LEDs) is unknown, a direct comparison can only be made to a limited extent. The SFH55 is slightly more efficient, despite having fewer LED chips. However, the luminous flux is only about 8-10% higher. However, the SFH55 and especially the SFP55 seem to run massively into their thermal limits; the very small increase in luminous flux indicates that the ceramic substrate is the main limiting factor here. Since a 7070 footprint can already dissipate around 180-200 W, this should apply even more to a larger 110110 footprint.
As expected, the luminance is low; it is further reduced by light emitted to the sides. This LED is therefore more suitable for lamps with a floodlight-like light pattern.
If = 200 mA
With 6500 K and 70 CRI, the SFP55 is a typical cool white LED with low color rendering. Classic YAG:Ce3+ phosphor is used here.
The tint shift with increasing current is hardly noticeable. The light quality is therefore acceptable for flashlights, especially since there is no annoying green tint visible.
- Ra: 72
- R9: -21
- CCT: 7072 K
- duv: 0.0012
The SFP55 is the larger sibling of the SFH55, but it does not manage to truly realize its potential for increased performance. The SFH55 is therefore the more economically sensible option.
Nevertheless, with over 14,000 lumens and a maximum current of well over 60 A, it is an impressive LED that also offers usable light quality within the low color rendering index range, especially with a good beam known from other ChangDa LEDs.
Thank you for reading this test. 