2026-02-04
- Type: single die, lateral
- Bin: —
- Color group: — (5000 K)
- CRI: 95
- Rated voltage: 3 V
- Max. Forward current: 3000 mA
- Max. Peak current: 6000 mA
- Viewing angle: — °
- Thermal resistance: — K/W
- Max. Temperature Tj: max. —°C
I received the F35R from Skilhunt in mid-January 2026. I do not have any further information about these LEDs apart from the values stated above.
The F35R has a simple design. The light surface is covered by orange phosphor and is surrounded by white silicone potting compound. Bonding wires are not directly visible, but can be seen beneath the potting compound when reflected appropriately. Four bonding wires appear to be used. All in all, the F35R is very reminiscent of a smaller version of the FFL505A or W5050SQ3, which have already been tested.
The footprint is compatible with all 3535 and XP boards, and the thermal pad is electrically insulated.
This LED may be from HSXLED (Hopthink), but this cannot be confirmed.
The luminous surface is covered with bright orange phosphor, which indicates a larger amount of red phosphor with a high wavelength maximum.
The luminous surface measures 2.69 mm2. There is virtually no light emitted to the sides.
- at 6000 mA (official maximum current): 1155 lm @ 3.63 V
- Power at official maximum: 21.8 W
- Efficiency at 6000 mA: 53.0 lm/W
- Maximum reached at 8.6 A, at this point 1286 lm @ 3.93 V
- Power at maximum 33.8 W
- Efficiency at maximum 38.1 lm/W
Data for 25 °C Tsp (at 85 °C the luminance values are around 13 % lower).
The F35R is relatively efficient, at least when compared to similar LEDs with similar color rendering and LES size. The Vf is quite high at maximum possible current, which should enable direct drive operation, at least with smaller batteries (14500 and similar).
The luminance is relatively high compared to other 3535 emitters with high CRI. However, due to the lower efficiency and the associated low luminous flux, the luminance does not match that of common 3535 emitters with a small light-emitting area. In general, LEDs with a small light-emitting area and low CRI are more suitable for throwers, with the disadvantage of visibly poorer light quality.
The beam is flawless, with no artifacts. Depending on the reflector used and its quality, slight rings may appear.
The spectrum shows no abnormalities. The specified CRI (Ra 95 / R9 80) is maintained. In general, the spectrum is very similar to other neutral white high CRI LEDs from recent production. The cyan hole is normal, and the R12 is lower, as expected with blue-pumped LEDs.
In addition to YGG:Ce3+ with λex=513 nm and YAG:Ce3+, Ca-a-SiAlON:Eu2+ is also very likely to be used. SSN:Eu2+ with a λex=620-630 nm is probably used for the red component. YGG:Ce3+ seems to be relatively popular for such high CRI LEDs because it is quite temperature-stable and, above all, can fill the cyan hole to a certain extent.
There is no strong tint shift with increasing current. The tint is solid and offers no cause for complaint.
- Ra: 95
- R9: 91
- CCT: 5348 K
- duv: -0.0007
The SL-F35R-3V is essentially a solid LED that does little wrong. The tint is good, the beam is just perfect, and the performance is relatively high.
The biggest disadvantage is the lack of a source of supply from Skilhunt, which makes it difficult or impossible to use in DIY projects. This means that this LED is only worth recommending in theory. There is also no official data sheet, so characteristic curves and other important parameters remain unclear.
Thank you for reading this test. 
), and very curious to see what they are going to do with this LED. For example replacing 519a in EC150?