Last night I tried to fix my old light meter with no luck. So I gave it to Duddo for him to chew. Browsed the internet for hours and found this one. Not so budget friendly at USD 143 on Aliexpress, but the accuracy looks good (down to 0,01lx) than most MIC meters. I need to be able to measure slight change in very low current output tests without having to buy more expensive light meter.
This light meter has an USB output for something unexplained in the downloadable manual. If it can record the log data directly to a *.txt file then it would be a great additional features.
Is it worth the price?
Product Features
Measurement of light intensity.
Spectral angle: ƒ′1 < 8%
Acceptance angle: ƒ′2 <2% cosine corrected (150°)
Auto-ranging and manual range selection.
MAX/MIN/AVG/HOLD/PEAK function.
APO function.
Save and Recall function.
Data Storage 128 measured data.
Back-Light Display.
USB interface.
Product Specifications
Measuring Range
20lux、200lux、2000lux、20000lux、200000lux
20fc、200fc、2000fc、20000fc
Resolution
0.01lux，0.001fc
Accuracy
±3% rdg ± 10dgts
Total accuracy: for C.I.E standard illuminate A(2856K)
Spectral response
CIE photopic
LCD Display
3 ½ digit liquid crystal display (LCD) with maxi-mum reading of 1999.
Sampling Rate
1 times/second
Low Battery Display
√
LUX/FC Selection
√
Display Back-Light
√
MAX/MIN/AVG
√
Data Logging
√(128 data)
USB interface
√
Auto power off
15 minutes, press power key to resume operation
Operating Environment
0ºC~50ºC （32ºF~122ºF） at < 70% R.H.
Storage Temperature
-20ºC~60ºC（-4ºF~140ºF），0~80% R.H. with battery removed from meter.
Battery
4 pcs 1.5V AAA size
Dimensions
170mm（L）x 44mm（W）× 40mm（H）
Weight
Approx. 200g
tandard Accessories
Battery, Manual, USB Cable, Software
Specifications and other information are subject to change without further notice.
Good find! Finally a chinese luxmeter that actually provides a good amount of relevant specs: i.e. 3% accuracy with CIE Illuminant A, 8% spectral accuracy. They seem to know what they are talking about too. If this is all true it is a very good luxmeter.
I ordered one on Aliexpress (still 163 euro :cry: ) in good hope that it is good enough for my throw-measurements, and then leave my expensive one fixed onto my integrating sphere (taking it on and off all the time I fear that I will break it at some point and I can never again afford replacing it).
I bought the Mobilux meter second-hand (hardly ever used but calibration was 5 years old, it has not deviated since I have it though) for 450 euro, new-price is about 1200 :person_facepalming: .
Btw, I just looked for new Extech meters and they have a pretty cool one now: Extech LT45. That model works around the (ok but) imperfect (8% accuracy, main error in the blue region) spectral response by letting the user select for different light sources that give different multipliers: it has a factory-set calibration for several pre-defined light sources but you can enter 4 multipliers yourself as well. Pretty neat if you have access to a calibrated light source!
It is close to 300 dollar though
