2024-01-22
The very popular Wurkkos TS10 Mini uses relatively unknown emitters, the CSP2323 from LatticePower. As there is currently virtually no reliable information on these LEDs, here is a first test.
The emitters tested here in the cool white version (according to Wurkkos 6000 K 90 CRI) were taken from a red TS10 Mini (purchased from Amazon DE/EU in July 2023).
Tj 85 °C, If 700 mA
- Type: single die, CSP
- Bin: unknown
- Color group: unknown ( ≈ 6000 K)
- CRI: 90
- Rated voltage: typ 2.85 V V
- Max. Forward current: 1,400 mA
- Max. Peak current: 2,000 mA
- Viewing angle: 120 °
- Thermal resistance: unknown
- Max. Temperature Tj: max. 135°C
Datasheet can be downloaded here: Datasheet (newest version, LatticePower)
In contrast to most other emitters, the CSP2323 is very small and flat. This is achieved thanks to the chip scale package design (CSP). In this design, the LED chip is embedded directly in the housing without a substrate and is soldered directly onto circuit boards, which massively reduces costs and size.
According to the definition, the housing in the CSP design may have a maximum surface area of 20 % more than the LED chip, for which the connections for SMD assembly must obviously be connected to the die without bonding.
The CSP2323 are extremely sensitive. Extreme caution is required when reflowing manually, as the yellow phosphor layer may fall off or break off as the temperature rises, or the white housing around the LED chip may simply break. These LEDs should therefore only be handled if this cannot be avoided.
As is usual with CSP LEDs, the footprint is special and does not conform to any commonly used standard. This makes it difficult to use such LEDs for flashlight modding. There is no dedicated thermal pad, which limits the maximum performance as only limited heat can be dissipated from the LED chip into the PCB.
As expected in the CSP design, the illuminated area takes up the majority of the LED package. Light is emitted from the side, which reduces the luminance. The light color of the luminous surface corresponds to the specified CCT.
The luminous area is 3.2 mm² in size. It is not possible to determine the exact size of the illuminated area here because of the light emitted from the side.
Within official parameters, as far as known:
- at 1,400 mA (official maximum current): 455 lm @ 3.09 V
- Power at official maximum: 4.32 W
- Efficiency at 1,400 mA: 105.3 lm/W
- Maximum reached at 3.2 A, at this point 683 lm @ 3.41 V
- Power at maximum 10.9 W
- Efficiency at maximum 62.5 lm/W
The maximum performance is limited due to the lack of a thermal pad. From just 2.4 A, the luminous flux drops significantly within a few seconds, and at around 3.2 A there is no further increase in luminous flux. This is a problem with all LEDs without adequate heat dissipation via a dedicated thermal pad.
Wurkkos specifies 1400 lm from three CSP2323 as the maximum luminous flux for the TS10 mini, which indicates that the LEDs are operated at a maximum current of exactly 1.4 A each. The latter is essential for such LEDs to ensure a long service life. Overcurrent of CSP-based LEDs is only recommended in exceptional cases.
In comparison, it is easy to see how the older XP-E2 has no chance, despite its high bin and cool white CCT with low color rendering. The Vf of the XP-E2 is also very high. The SST-12 has a similar characteristic curve to the CSP2323, despite the dedicated thermal pad. The Nichia 219BT-V1 in the high-CRI version is also older and is also less efficient.
Data for 25 °C Tsp (at 85 °C the luminance values are around 13 % lower).
Due to the light emitted from the side and the already reduced efficiency due to the high color rendering index, the luminance is low. This LED is not suitable for throwers, although LEDs with a dedicated thermal pad are preferable here anyway.
This beamshot was taken with a Wurkkos TS10 mini brass with 4000 K CSP2323. The TS10 mini has a triple lens without texturing. The beam is more on the floody side. There are very slight color shifts around the flood spot, but these are not noticeable in either the cool white or the neutral white version. The same applies to use with reflectors (OP/SMO).
This CSP2323 has a very high CCT. Wurkkos specifies 6000 K for the cool white version tested here, with over 6500 K being achieved. As stated, the color rendering is very high and, including R9, is at a similar level to that of well-known Nichia emitters. However, the duv is well above 0 and the tint is slightly greenish. Although this is not a problem during normal household and outdoor use, it could be an annoying factor depending on your preferences.
- Ra: 93
- R9: 67
- CCT: 6661 K
- duv: 0.0033
Due to its design, the CSP2323 is not very powerful and can hardly be overcurrent protected. It is also very sensitive to handle and the special footprint requires corresponding circuit boards. On the other hand, it is extremely compact and cost-effective, the color rendering index is very high and the beam quality is okay for normal flashlight use.
Pro
- extremely small in size
- very cost-efficient
- high color rendering index
- good beam quality
Neutral
- slightly greenish tint (sample tested here)
Contra
- Low overcurrent capability, due to CSP design
- Very sensitive during handling
- Special footprint, no compatibility with existing accessories
Thank you for reading the test. 
