Roger, Jan-Peter, Danny, Steve, Matthew, Jose, Fons and Graeme, I can't thank you enough for all your answers and help with this question. Your answers have helped me and given me the information I needed to find. Are any of you aware of an inexpensive spectrophotometer capable of measuring the spectral power distribution of light sources in similar increments (5 or 10 nm intervals or segments) ? I have contacted Minolta and they do have some interesting measuring instruments but the cost is a bit prohibitive for my project. In addition it would be nice if the instrument could also measure color temperature and CRI. I do have another question but will initiate another thread with a different subject line so that it becomes easier to follow. Thank you very much again for your answers and all your help. Joseph. On March 05, 2014, at 2:23 PM, Roger Breton <graxx@videotron.ca> wrote:

These datasets float on a few servers around the world. San Diego University Color Vision site is one source I know who has them. The Munsell Color Science Institute is another site which I used in the past that I remember has them.

Best / Roger

-----Original Message----- From: colorsync-users-bounces+graxx=videotron.ca@lists.apple.com [mailto:colorsync-users-bounces+graxx=videotron.ca@lists.apple.com] On Behalf Of Joseph Chamberlain Sent: Wednesday, March 5, 2014 4:54 PM To: colorsync-users@lists.apple.com Subject: Graph and numbers for SPD of iluminants D55 and D65.

Hi, everyone.

I am looking for both a graph and numerical values of the SPD (spectral power distribution) of illuminants D55 and D65 but haven't had much luck.

The information I need is the power distribution for wavelengths across the visible spectra in 5 to 10 nm increments. I would like to have both the numerical values and also a graph showing this power distribution.

Is anyone aware of where I can find this information ?

Thank you in advance,

Joseph. _______________________________________________ Do not post admin requests to the list. They will be ignored. Colorsync-users mailing list (Colorsync-users@lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/colorsync-users/graxx%40videotron.ca

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Hi, Robin. The detailed information you provided is extremely help and detailed. Thank you for taking the time to write such a helpful and informative post. I had contacted Minolta and was planning to contact them again to find out if their equipment is available for rental since the cost for purchase is quite high. With this and cost in mind the options you provided are great and very helpful. I will look at the X-Rite solution you recommended as it appears to provide all the features I need and does so at the most reasonable price. Thank you very much for your help and detailed reply, Joseph Chamberlain. On March 10, 2014, at 8:22 AM, Robin Myers <robin@rmimaging.com> wrote:

Hello Mr. Chamberlain,

You have two conflicting requirements for your project's instrument ; an instrument that measures color temperature (CCT) and CRI, yet is low in cost. Low-cost instruments almost exclusively measure light only then ship the data to a host computer for the computations. One indicator for this class of instruments is that they do not have their own information display. Examples include the i1Pro, Lighting Passport, fiber optic instruments, etc.. When an instrument has an information display it has its own internal computation engine and the cost for the instrument is much higher. Examples include the Konica-Minolta FD-7, Photo Research PR-655, and so on.

For the lowest cost solution I recommend the X-Rite i1Basic Pro 2 (SRP $1199) combined with SpectraShop ($95). This solution will measure light sources (including flash) at 10 nm intervals and can calculate CRI, CQS, duv, CCT, power, and more. See http://www.xrite.com/i1pro-2-color-calibration-profiling-solutions for i1Pro 2 information and http://rmimaging.com/spectrashop.html for SpectraShop information. This combination will also measure reflective and transmissive objects, so it can adapt to any additional needs. This combination will work with both Mac and PC.

The next lowest solution would be the Asense Lighting Passport (SRP $1775) and works with iOS devices such as iPhone, iPod and iPad. It measures light sources only (no mention is made of flash). More info can be found at http://lightingpassport.com/index.html. This instrument measures at <8 nm resolution. The software for this is PC only at the moment.

Another solution would be the Moreland Lighting MK350 ($2195), which measures lighting only but it does have its own display. Here is a link to its information page http://morelandlighting.com. It measures at 1 nm intervals (a good feature for spiky light sources) and can save data onto SD cards. The main software is PC only, but exporting the data in Excel format to an SD card will allow Macs to get to the data too.

Other solutions using fiber optic spectroradiometers will cost considerably more. Examples here are Ocean Optics, StellarNet, Edmund Scientific units, and others. These solutions definitely require a host computer to do the computations. Most of these offer PC only software.

The next step up would be instruments such as the Konica-Minolta FD-7 ($6000+). This is a standalone instrument with an information display on the instrument.

Instruments such as the ones from Photo Research are very expensive ($12000+), are standalone and are very adaptable. But they are probably a bit outside your budget.

These are only a few choices, more can be found with a bit of searching.

Robin Myers

On Mar 10, 2014, at 4:05 AM, Joseph Chamberlain <drjchamberlain@gmail.com> wrote:

...

Roger, Jan-Peter, Danny, Steve, Matthew, Jose, Fons and Graeme,

I can't thank you enough for all your answers and help with this question. Your answers have helped me and given me the information I needed to find.

Are any of you aware of an inexpensive spectrophotometer capable of measuring the spectral power distribution of light sources in similar increments (5 or 10 nm intervals or segments) ? I have contacted Minolta and they do have some interesting measuring instruments but the cost is a bit prohibitive for my project. In addition it would be nice if the instrument could also measure color temperature and CRI.

I do have another question but will initiate another thread with a different subject line so that it becomes easier to follow.

Thank you very much again for your answers and all your help.

Joseph.

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Hi does anyone know if there are figures for an approximation for generic flash? Just for a comparative graph Best Matthew Ward ________________________________ Matthew Ward matthew@matthewwardphotography.com 07850 611 778 www.matthewwardphotography.com www.imagebasedlighting.co.uk ________________________________

...

Hi, everyone.

I am looking for both a graph and numerical values of the SPD (spectral power distribution) of illuminants D55 and D65 but haven't had much luck.

Joseph, These values were taken from "Illuminations.cxf", a file included with Eye-One Share. The data is in "lambda - Power" format - not sure why the D65 has more decimal places.

D55