Re: Need buying advice on spectrophotometer
Re: Need buying advice on spectrophotometer
- Subject: Re: Need buying advice on spectrophotometer
- From: "dpascale" <email@hidden>
- Date: Fri, 8 Aug 2008 15:30:54 -0400
Hello Mark,
It would be nice to be able to sample a smaller area on the diffusor so I
can also get a rough idea about the homogeneity of the illumination and
if there are any SPD shifts at different locations.
This is called the "Near Field". Unless what you want to illuminate is
placed on the diffuser, the result will be different from what you measure
in the "Far Field", i.e. further away from the diffuser.
If you have deep pockets (single to multiple 10K$ side), you could look at
very expensive spectroradiometers instruments such as the ones sold by
PhotoResearch.
A more common choice is the i1 Pro from X-Rite/GretagMacbeth (1 to 1.5 K$).
You could use it in emission mode to read the light coming out of your
diffuser and use it in Ambient mode, with the diffuser to measure the far
field. Of course, the measurement units are different (Luminance vs
Illuminance), but you could measure the uniformity this way.
As a bonus with your i1, you get Display, Projector (optional), and Printer
calibration software (the exact software features depend on the package you
buy)!
And may I also suggest using the i1 Pro with BabelColor CT&A (from my
company), which would enable you to easily measure such data (including
spectral info) for up to nine points on your diffuser (or display, or
illumination plane). For more info, you can look in the CT&A Help manual;
look in the Spectral tools "Graphic Interface/ISO 3664+ tools" and Technical
data/Spectral tools description/ISO 3664+ tools" sections..
Regards,
Danny Pascale
email@hidden
www.babelcolor.com
----- Original Message -----
From: "Mark" <email@hidden>
To: "ColorSync Users Mailing List" <email@hidden>
Sent: Friday, August 08, 2008 2:09 PM
Subject: Need buying advice on spectrophotometer
Hello color experts,
I'm looking for a device that will give me the spectral power
distribution for halogen and LED light sources. The light sources are
placed behind a diffusor - size is about 50x50mm. The halogen lamps I'd
like to test are either 35 or 50 watts. I'd also like to measure the
effect of various dichroic filters.
It would be nice to be able to sample a smaller area on the diffusor so I
can also get a rough idea about the homogeneity of the illumination and
if there are any SPD shifts at different locations.
If the device has an LCD display that shows me the SPD that's nice. More
important would be a way to download recorded SPDs to the computer (USB).
Mac compatible software would be nice too.
I have zero knowledge about what devices are out there to help me do this
and would welcome some advice.
Thanks in advance.
Best regards
Mark
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