2025-11-24
- Type: quad die, flip chip
- Bin: —
- Voltage: 6 V
- Color group: — (5000 K)
- CRI: 95
Note: For further information on the FL5009R mentioned here, please refer to the detailed test already carried out on this LED.
An official data sheet and further information are not available for the SL-F50-S tested here.
This emitter was provided to me by TLF user @SammysHP from Skilhunt. Many thanks for that. You can find Sammy’s review of the H300 V4 here, where you can find lots of information about the light and more beam shots with this LED!
Visually, this LED differs from the usual well-known models. With its 5050 footprint and LED chip arrangement, it bears certain similarities to the XHP50.3 HI and FL5009R.
The gap between the LED chips is clearly visible due to the lack of phosphor. This is unusual and does not correspond to any known model. These gaps could affect the light image. This may serve to increase the luminance.
The SL-F50-S measures 5.00 x 5.00 mm. The footprint is compatible with standard 5050 MCPCBs, in which case it is operated at 6 V. It is likely that a forward voltage of 12 V is possible with the appropriate MCPCB; at least, this is implied by the separate connections.
The phosphor appears relatively coarse-grained, which is particularly visible directly on the light-emitting surface. In general, however, the light-emitting surface, including the lateral radiation, is similar to the FL5009R, which is manufactured by Hopthink (HSXLED). The gap between the LED chips is clearly visible as a dark gray space.
- Maximum reached at 10.00 A, at this point 3730 lm @ 7.79 V
- Power at maximum 77.9 W
- Efficiency at maximum 47.9 lm/W
Data for 25 °C Tsp (at 85 °C the luminance values are around 13 % lower).
The SL-F50-S is very similar to the FL5009R in terms of its characteristic curve, which is particularly noticeable in the performance diagram. The Vf is high, but this also applies to the FL5009R to a similar extent.
In general, the SL-F50-S, FL5009R, and XHP50.3 HI (all 90 CRI) are very similar in terms of efficacy. Although there is no evidence for this and no further information is available, the SL-F50-S may have been manufactured in a newer iteration of HSXLED/Hopthink; at least, it appears to use the same or very similar LED chips as the FL5009R.
The FFL707A clearly outperforms it due to its larger LED chips and better heat dissipation (7070 footprint).
The luminance is roughly the same as that of the FL5009R, but it is slightly higher, which is probably due to the gaps between the chips. However, when installed in a lamp, this effect should be limited.
The beam is good, depending on the reflector. With SMO reflectors, a donut hole may occur. As long as the correct focal length and an OP reflector or beaded TIR are used, there are no problems. Excellent beam shots can be found in Sammy’s review of the M300.
The tint is very good and gives no cause for complaint. The duv is exactly zero, R9 and CRI are extremely high. The CCT is approximately 5000 K.
It is very likely that YAG:Ce3+ is used in combination with Ca-a-SiAlON:Eu2+ and SSN:Eu2+. The spectrum is generally relatively similar to other high CRI LEDs; it is possible that this or a similar phosphor mixture is already available ready-mixed.
- Ra: 97
- R9: 98
- CCT: 5201 K
- duv: 0.0000
The SL-F50-S is an interesting LED in terms of design, and like the FL5009R before it, it does a lot of things right. It has good tint, similar efficiency to a Cree XHP50.3 HI, and a good beam (when using an OP reflector or beaded TIR, otherwise there is a risk for getting a donut hole).
The disadvantage is the lack of a data sheet and a source of supply, as this LED will probably only be used in Skilhunt lamps in the future. Should this change, this test will be updated accordingly.
Thank you for reading this test. 