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Tuesday, January 7, 2014

••◊ UPRtek MK350 Handheld Spectrometer

I'm having a total geek out fun time with this handheld spectrometer from UPRtek.  It's on loan from Video Gear, but this is the type of toy that makes me wish I had an extra $2k laying around.  With the simple press of a button it will show the correlated color temperature (CCT), color rendering index (CRI), visual spectrum, as well as both the 1931 and 1976 CIE diagrams.  Of my film making friends I'm pretty sure I'm on the only one who understands CIE diagrams!

Last weekend I used this meter to measure a bunch of video lights at Video Gear.  The manufacturers may give hand waving statements about light quality, but the meter shows the cold truth. 


It's a partly cloudy day outside so I took a quick measurement of noon time daylight.  It measures about 5600K with a CRI of 99 - exactly what you would expect.


Here's a plot of the fluorescent task light in my office.  Not exactly the prettiest light, but I kinda already knew that.  I would describe it as dirty orange, so I'm surprised that the CRI is as high as it is.  The color spectrum shown in the data plot below is pretty darn ugly as well.


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