2025-07-27
- Type: quad die, round die
- Bin: unknown
- Color group: neutral white
- CRI: around 90
This LED was purchased directly from China. BLF user @yoelpez helped me get additional information about this LED, thanks for that!
The TC7070 is a 7070 emitter manufactured by Hopthink (sometimes also known as HSX or HSXLED). The special feature here is the round illuminated surface with four individual LED chips. These are connected in a 2S-2P configuration, resulting in a forward voltage of 6 V.
The individual LED chips are each connected with 4 bonding wires. The white silicone was poured in after the phosphor gel was applied and appears unevenly distributed. There are even âair bubblesâ, as can be seen on the bonding wires. The white silicone is very susceptible to dust and a clean environment should be ensured when handling the LED.
The footprint offers no special features, it is fully compatible with existing 7070-MCPCBs. The notch in the footprint marks the anode.
The illuminated area is 7.2 mm2. There is no laterally emitted light, which should improve the beam in optics.
- Maximum reached at 9.0 A, at this point 2526 lm @ 6.49 V
- Power at maximum 58.4 W
- Efficiency at maximum 43.2 lm/W
Data for 25 °C Tsp (at 85 °C the luminance values are around 13 % lower).
The maximum achievable output is not very good. Despite the 7070 footprint and the associated large heat dissipation surface, not even 60 W is achieved. This is presumably limited by the thermal resistance of the LED chips to the substrate, as 7070 LEDs can sometimes produce well over 100 W.
The efficiency is also not very high. Although a high CRI version was tested here, even with a cool white version with low CRI, more than 3000-3200 lm would hardly be possible unless there are significant differences in the mounting of the LED chips.
The Luminus LEDs with low CRI are far more powerful. Even the single-die version (SFT-40) beats the TC-7070 by worlds.
The luminance, on the other hand, is quite high thanks to the light not being emitted from the side. This LED could certainly be used for throwers, at least at very high current levels. However, this is not recommended - after the test and a trial run for 15 minutes at 9 A, small black spots/grains formed on the surface, see detailed photos. These cannot be wiped off and are very probably embedded in the phosphor mixture. Operation at maximum current is therefore not recommended and is likely to lead to early failure of the emitter!
The spectrum is similar to that of other Hopthink/FFL LEDs. A relatively complex phosphor mixture is used, consisting of (presumably) LuAG:Ce3+, YAG:Ce3+, Ca-a-SiAlON:Eu2+ and SLA, whereby the emission peak for the latter has been shifted to around 630-635 nm.
The tint is rosy and subjectively pleasant, but could be too rosy for some users.
95 CRI is not achieved, but the LED was not supplied to me with any CRI specification.
- Ra: 92
- R9: 67
- CCT: 4532 K
- duv: -0.0095
This LED is at least something new: four LED chips that together form a round LES have never been seen in mass production before. The performance is average, but the tint is good, as is the beam, and the luminance is relatively high. However, it should be noted that this LED should not be operated at the maximum possible current in order to avoid long-term damage to the phosphor, and the processing quality should also be improved.
Rumor has it that the 6 V version of the FFL707 from Fireflylite (sometimes called FFL707MD, the FFL707RD seems to be a 3 V version consisting of only one chip and is actually a different LED) is equivalent to this LED. As I have no official source to confirm this, it remains a rumor for now.
As soon as I have clear confirmation or it turns out that the FFL LED mentioned corresponds to the TC-7070 tested here, the title will be corrected accordingly.
Thank you for reading this test. 
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