Opple Light Master 4 discussion thread (new 2023 model)

Flashlight Modding and DIY Parts
1395

Here are measurements of high-CRI LEDs with varying levels of R9. I selected these specific LEDs because I have the exact models from the same manufacturer. It’s important to note that LEDs can vary significantly depending on the bin used, so measurements might differ even if the model numbers are identical. However, since my lights were purchased around the same time the reviews were conducted, there’s a good chance the LEDs came from the same bin.

Reference Measurements

Samsung LH351D 5000K (Sofirn SP10 Pro, reviewed by zeroair) Review link

  • CRI: 88
  • R9: 43
  • Duv: 0.0086 (output level: 4/5)

Nichia E21A 5000K (Noctigon KR4, reviewed by maukka) Review link

  • CRI: 97
  • R9: 96
  • Duv: 0.0004 (output level: 5/7)

LatticePower CSP2323 6000K (Wurkkos TS10, reviewed by koef3) Review link

  • CRI: 93
  • R9: 67
  • Duv: 0.0033 (output level: not specified)

My Measurements

Below are my measurements, taken with the LM4 using different software versions. All measurements were taken at output level 5 (stepped ramp, max level 7).

LH351D 5000K

  • CRI: 88.1, R9: 30.1, Duv: 0.0070 [Opple HOME 3.3.1]
  • CRI: 89.6, R9: 61.5, Duv: 0.0077 [Desktop 1.2.1]
  • CRI: 79.3, R9: -32.7, Duv: 0.0077 [Opple HOME 4.3.1]

CSP2323 6000K

  • CRI: 92.0, R9: 56.6, Duv: 0.0036 [Opple HOME 3.3.1]
  • CRI: 94.6, R9: 81.3, Duv: 0.0040 [Desktop 1.2.1]
  • CRI: 87.6, R9: 29.9, Duv: 0.0040 [Opple HOME 4.3.1]

E21A 5000K

  • CRI: 96.4, R9: 92.1, Duv: 0.0011 [Opple HOME 3.3.1]
  • CRI: 93.9, R9: 84.5, Duv: -0.0005 [Desktop 1.2.1]
  • CRI: 95.3, R9: 81.3, Duv: 0.0009 [Opple HOME 4.3.1]

Comparison of R9 Measurements

LH351D 5000K

  • 30.1 [Mine, Opple HOME 3.3.1]
  • -32.7 [Mine, Opple HOME 4.3.1]
  • 61.5 [Mine, Desktop 1.2.1]
  • 43 [Zeroair, reference]
    comment: Opple HOME 3.3.1 is the closest to the reference. HOME 4.3.1 shows negative R9. This seems weird.

CSP2323 6000K

  • 56.6 [Mine, Opple HOME 3.3.1]
  • 81.3 [Mine, Desktop 1.2.1]
  • 29.9 [Mine, Opple HOME 4.3.1]
  • 67 [Koef3, reference]
    comment: Opple HOME 3.3.1 is the closest to the reference. Desktop 1.2.1 shows very high R9 that is indistinguishable from R9 from my Nichia E21A.

E21A 5000K

  • 92.1 [Mine, Opple HOME 3.3.1]
  • 84.5 [Mine, Desktop 1.2.1]
  • 81.3 [Mine, Opple HOME 4.3.1]
  • 96 [Maukka, reference]
    comment: Opple HOME 3.3.1 provides the closest match.

Conclusion

For all three LEDs, the measurements from Opple HOME 3.3.1 align most closely with the reference data, making it the most reliable software version for assessing R9 values. While I don’t expect the LM4 to deliver absolute accuracy, I aim to use it to distinguish lower-R9 LEDs among high-CRI options. For this purpose, I believe version 3.3.1 is the most suitable.

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