2025-04-02
- Type: lateral, monolithic
- Bin: —
- Color group: — (5700 K)
- CRI: 90
- Rated voltage: 3 V
- Max. Forward current: — mA
- Max. Peak current: — mA
- Viewing angle: — °
- Thermal resistance: — K/W
- Max. Temperature Tj: max. —°C
The emitter tested here was ordered from Goofish in China several months ago. There is no further information on a data sheet or manufacturer/part number. It should be noted that buying from platforms for the Chinese domestic market such as Goofish is not trivial, and forwarding/dropshipping services such as Superbuy do not always work. I was supported in this by a Chinese user. Thank you very much at this point.
I was interested in this LED because of the large LED chip and orange phosphor. This was already clearly visible in the article photos and basically indicates a phosphor mixture with a high red content, which is typical for LEDs with high color rendering.
The LED chip sits on a dark gray substrate. It can be assumed that this is the same chip as a CBT-90 or SBT-90 1st gen, the number of bonding wires and the characteristic striped vias pattern are also identical.
The chip is surrounded by a gold-colored frame in which a thin glass pane sits.
The footprint is unusual and does not conform to any (common) standard. Although the package itself is 7.00 x 7.00 mm in size, the footprint itself does not resemble the 7070 at all. The anode/cathode connections are much larger, while the thermal pad is much smaller, which could affect heat dissipation.
Due to this strange footprint, 7070 boards cannot be used; a 5050 board was modified for the test. However, reflowing to this modified 5050 board went without any problems.
The illuminated area is 9.9 mm2. Please note that some light is reflected by the metal frame.
- Maximum reached at 30 A, at this point 2285 lm @ 3.85 V
- Power at maximum 115.5 W
- Efficiency at maximum 19.8 lm/W
Data for 25 °C Tsp (at 85 °C the luminance values are around 13 % lower).
As no information on the maximum current is available, only the maximum possible current and the characteristic curve are used for the evaluation.
The LED tested here is the most inefficient one I have ever tested to date. Although the LED achieves an impressive 30 A and 116 watts, which are not bad values for such a small thermal pad, 19.8 lm/W is extremely low and is well within the range of standard halogen lamps. (For comparison: an overcurrent 12 V 20 W halogen lamp achieves over 35 lm/W at 23 V!)
Of course, all modern emitters - even those with high color rendering - run circles around the LED tested here. A modern SBT-90.2, for example, achieves a maximum luminous flux that is almost three times higher with a significantly lower Vf.
The Vf is relatively high compared to other LEDs, although this is put into perspective by the large chip and the numerous bonding wires.
Based on these measured values, I assume that this LED is very old or that the performance is severely limited by the chip. The LED chip corresponds to that of a CBT-90 and later SBT-90 (1st generation), which came onto the market in 2009. The luminous flux, which is very low by today’s standards, corresponds to that of a CBT-90 in Bin LB (approx. 1300 lm at 9 A), which speaks for the LED chip and similar phosphor mixture of a CBT-90 W57H (high CRI version).
The luminance is therefore extremely low. The LED is not really suitable for throwers.
The beam is perfectly fine. A short test with an S2+ OP reflector did not reveal any disturbing artifacts such as color fringing or different colored spill.
This LED is therefore suitable for flashlights.
The tint is good. With a CRI of 91 and R9 of 50, the spectrum is similar to that of earlier high CRI LEDs.
The LED looks like a CBT-90-W57H, but not as a chip-on-board, but as a classic emitter on its own package. This theory is supported by the precisely matching color temperature.
There is no strong tintshift with increasing current.
- Ra: 91
- R9: 50
- CCT: 5712 K
- duv: -0.0025
You can find really interesting LEDs in China, like this curiosity shown here. This LED here is extremely inefficient, especially at high operating currents, and is probably much older than the package design suggests. In general, the LED is very similar to a Luminus CBT-90, at least in terms of its electrical and optical properties, although the package and design differs massively.
For flashlights or other applications, this LED is therefore of little interest today, and is really only a curiosity.
Thank you for reading this test. 