<html>
<head>
<style>
.hmmessage P
{
margin:0px;
padding:0px
}
body.hmmessage
{
font-size: 10pt;
font-family:Verdana
}
</style>
</head>
<body class='hmmessage'>
<BR>Also, I'm curious how you'd use LAMPCOLOR for a UV-lamp? Obviously the efficacy would not be the usual 179?<BR>
<BR>
YC Huang<BR>
<BR>
<BR>> ------------------------------<BR>> <BR>> Message: 3<BR>> Date: Sun, 15 Mar 2009 09:54:28 -0700<BR>> From: Greg Ward <gregoryjward@gmail.com><BR>> Subject: Re: [Radiance-general] I can't get even similar irradiance<BR>> values from a lamp.<BR>> To: Radiance general discussion <radiance-general@radiance-online.org><BR>> Message-ID: <A45DA6FC-7D4E-4B42-82EF-7FDD5CBECC3B@lmi.net><BR>> Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed<BR>> <BR>> How did you measure the UV reflectance of the surfaces of your box? <BR>> Most paints drop off dramatically from the visible spectrum to UV. <BR>> White paints may re-emit UV as visible so they appear "whiter" under <BR>> daylight illumination. You really need to know the behavior of your <BR>> paint with respect to ultraviolet wavelengths to do this correctly.<BR>> <BR>> -Greg<BR>> <BR>> > From: Minki Sung <minki.sung@gmail!
.com><BR>> > Date: March 14, 2009 10:52:03 PM PDT<BR>> ><BR>> > Dear Radiance users,<BR>> ><BR>> > I'm writing here for third time and I always sorry for just asking. <BR>> > I'm modeling a small box has a several bared cylindrical <BR>> > fluorescent lamps (actually UV lamps) inside and want to know the <BR>> > irradiance level on the surfaces of the box. The cylindrical lamps <BR>> > has 32mm in diameter and 540mm in length and The radiance of 44W/sr/ <BR>> > m2 calculated with the UV output of the lamps (7.5W) was applied to <BR>> > the lamps. Before calculating the small box model I checked <BR>> > irradiance values with an experiment measuring UV intensity at the <BR>> > distance of 1 m and compared that with the same simple RADIANCE <BR>> > calculation and the result was reasonable. However, the calculation <BR>> > results are higher than those of experiments by 2~4 times with!
the <BR>> > small box model. The small box is not simple but no
t so <BR>> > complicated. I have modeled the lamp both as a cylinder and 72 <BR>> > polygons but there were not so much changes. Only one channel was <BR>> > used to calculate irradiances of UV from modeling to issuing <BR>> > results and only diffused reflections were assumed. Geometric <BR>> > errors or abnormal radiance distributions of lamps could be assumed <BR>> > to cause the discrepancy, but 2~5 times are too large<BR>> > Here is my rtrace options.<BR>> ><BR>> > cat pts_sensor.pts | rtrace -I -oov -ar 128 -ad 512 -as 256 -ab 2 - <BR>> > ds 0.02 uv.oct > uv.dat<BR>> ><BR>> > It would be appreciated if anyone give me advice.<BR>> ><BR>> ><BR>> > Sung<BR>> <BR>> <BR>> <BR>> ------------------------------<BR>> <BR>> _______________________________________________<BR>> Radiance-general mailing list<BR>> Radiance-general@radiance-online.org<BR>> http://ww!
w.radiance-online.org/mailman/listinfo/radiance-general<BR>> <BR>> <BR>> End of Radiance-general Digest, Vol 61, Issue 11<BR>> ************************************************<BR><BR><br /><hr />Make the most of what you can do on your PC and the Web, just the way you want. <a href='http://www.get.live.com/wl/all' target='_new'>Windows Live</a></body>
</html>