Wondeful addition of Philips Hue on the meter!

  • People were right that it doesn't have much cyan at all, and I think the color rending would be in the mid to high 90 if it included that in the light. For now though, I've just set my hue to a green preset I've made a while back and it VERY closely matches the green you have up, that slightly yellowish green, oh it's great! I knew there was something I really liked about it--there's no drop in the spectrum and no high spike in the blue (purple)!

  • Yes - we need to re-measure these, but it is fun to see for now.

    CRI numbers from the Ocean Optics meter are not very reliable, (our calibration is not so good).

  • @herf Do you use different meters for different light sources? I hadn't noticed that, wow, that's interesting. Why not just use one?

  • The Hue is pretty cool. The LEDs are available for purchase from LumiLEDs. The green channel is called lime-green. It is a phosphor converted green, very wide-band FWHM maybe 80 nm. Red and blue are narrow band monochrome regular LEDs, all of the Rebel family. I'd like to build an Ario lamp with them but it would be $$$$$$$. I have other ideas for something more amazing with 90+ CRI from 1600K to 9000K though at an additional $100 price. Now if we could sell 250K of them the price could be much better.

  • @timpster We had the Ocean Optics for a few years but couldn't get/keep a decent calibration out of it, so we redid all the data with the PR655. It is "nice" to have 1nm data (very nice spectral lines for fluorescents, etc.) but when you're talking about color temperature and have a meter that is nearly 1000K off at measuring it, doesn't look so good. Most people who use these meters seem to keep calibration sources on-hand, which works a lot better.

    The PR655 outputs 4nm data, but it is incredibly stable.

    Most of our transmission ("filters") data is done with a $400 ColorMunki, and we'll probably redo it with the PR in the future. But we can't measure the difference between the two for circadian work. There is a small difference for color calibration work.

  • @arioda What's especially interesting about the Philips Hue is how it matches the curve of Cree's Truewhite (with its red bump around 620nm) almost exactly, and they both have a nice high-CRI white at 2700K.

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