I am very impressed with the performance of the RaLeno PLV-S192 LED video light panel.
It’s much much brighter, very uniform, and several times cheaper.
I bought it on Amazon for $47.99.
While brightness uniformity is important, it is only factor in choosing a light. Equally or more important is CRI (colour rendering index). SPD (spectral power distribution) shows the power emitted at each wavelength but tells us little about the CRI which describes how a light source makes the colour of an object appear to human eyes and how well subtle variations in colour shades are revealed.
A light may have perfect uniformity but introduce a horrible colour cast.
The Raleno PLV-S192 has a claimed CRI of 95 which would suggest it is a very good light in more ways than pne.
Next time, I will measure the CRI of two lights.
Thank you — a valuable post. There should be a thread about light sources with this method of test.
I don’t think this expression is good.
– https://www.amazon.com/gp/product/B07PMSBLTH/
So, are all of the people who posted positive reviews on Amazon about the film scan quality of this product a salesperson?
– Suggested backlight sources for scanning film with DSLR - #13 by adam
I am sorry – I have probaly meant the Kaiser, as I ended up using Raleno too. However, Ralenos diffusing glass has stripes which are visible upon a photo. The allover uniformity is solid but the micro uniformity is not.
This can be remedied with one more layer of diffusing or opal glass.
Btw - did you make the spectral distribution mesurements yourself? I wonder if that could be corrected via a profile in case you also have the data not only the screenshot …
Regards!
The SPD curve is very nice, and I don’t need a profile…
CRI measured for Raleno PLV-S192:
Measured at 100% 5000K Setting
Result is XYZ: 26652.889361 27160.778107 24263.266835, Yxy: 27160.778107 0.341367 0.347872
Ambient = 27160.8 Lux, CCT = 5135K (Duv -0.0004)
Suggested EV @ ISO100 for 27160.8 Lux incident light = 13.4
Closest Planckian temperature = 5147K (DE2K -0.6)
Closest Daylight temperature = 5255K (DE2K -5.1)
Color Rendering Index (Ra) = 98.2 [ R9 = 94.9 ]
R1 = 98.3 R2 = 98.9 R3 = 99.1 R4 = 97.4 R5 = 98.3 R6 = 95.6 R7 = 98.8
R8 = 98.9 R9 = 94.9 R10 = 96.7 R11 = 94.2 R12 = 83.0 R13 = 98.5 R14 = 98.3
Television Lighting Consistency Index 2012 (Qa) = 98.6
IES TM-30-15 Rf = 94.03 Rg = 101.39 CCT = 5135 Duv = -0.002275
In comparison, the 299 USD Negative Supply Basic 4x5 MKII CRI 99’s report is:
No setting can be applied to this model. The factory CCT is unknown (possibly 5000K)
Result is XYZ: 8725.691838 9041.748206 6769.822186, Yxy: 9041.748206 0.355610 0.368491
Ambient = 9041.7 Lux, CCT = 4696K (Duv 0.0043)
Suggested EV @ ISO100 for 9041.7 Lux incident light = 11.8
Closest Planckian temperature = 4575K (DE2K 5.9)
Closest Daylight temperature = 4667K (DE2K 1.7)
Color Rendering Index (Ra) = 98.1 [ R9 = 91.6 ]
R1 = 97.1 R2 = 97.7 R3 = 99.1 R4 = 98.3 R5 = 97.6 R6 = 98.0 R7 = 99.6
R8 = 97.1 R9 = 91.6 R10 = 96.3 R11 = 98.8 R12 = 96.6 R13 = 96.8 R14 = 99.6
Television Lighting Consistency Index 2012 (Qa) = 98.7
IES TM-30-15 Rf = 97.82 Rg = 99.19 CCT = 4696 Duv = 0.003789
