Gallery of Lights
The Site => General discussion => Topic started by: A_lights on February 06, 2011, 10:44:20 PM
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http://www.garagejournal.com/forum/forumdisplay.php?f=30
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You are welcome to go let them know about this site! ;-)
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I have shocked to discover that in the thread of "T8 upgrade ?", the member that started this thread, incorrectly listed the color temperature available for fluorescents, while called the 5000K color FULL SPECTRUM!!!
(Before the following text, i used an insulting text, and i deleted it following the discomfort that happened because of this)
There is no color temperature called such. 5000K is daylight, like 6500K, but less blue.
5000K, haven't a richer spectra then the other colors, when analysing it with a spectroscope and the spectral output depends on the phosphors type used.
Generally, the only full spectrum lights source available is:
1. The sun (Natural blackbody) and the moon (Reflected sunlight).
2. Incandescent and halogen lamps (Artificial blackbodies).
3. Short arc xenon lamps (Discharge lamps which produce a flat continuous spectrum in the visible light, that is the closest non blackbody emission to the solar spectrum).
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First off Dor123, don't call him idiot. That is mean and he probably just doesn't have deep knowledge in lighting, it doesn't make him an idiot... Think it if you want, but don't tell it...
Secondly, he's not totally wrong, he likely said what he actually read on the tubes. 5000K tubes are often marketed as "full spectrum", even if this term is technically "incorrect". But these tubes do have 90 CRI (those marketed here in N-A), which is a broader spectrum than most fluorescent tubes (except the 9xx triphosphor series).
And also, carbon arcs have a full spectrum too, or close ot it. ;)
But seriously, stop calling people idiots or whatever. Being intolerant won't make things better... There are people who know less things in lighting than you, please be tolerant with them.
I'm usually not the kind of person who makes cold, admin-like warnings, but being mean with others is something I don't like to see... :-\
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@dor123, I have seen several 5000K tubes labeled full spectrum, nobody deserves to be called an idiot, it's not nice! I have been called an idiot a LOT over the years, and I have learned to ignore it, but if you are going to be mean to other members on different sites, don't post it here! I don't want to see it!
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Ok, sorry.
But it is annoying that there are lamps that label "Full Spectrum" despite they haven't a full spectrum.
The 5000K color fluorescents in NA probably comes often with the deluxe phosphors which gives a continuous spectrum and >90% CRI and therefore often called full spectrum, but the 950 fluorescents don't give a continuous spectrum, so the term "Full Spectrum" isn't suitable as a general name for this color, but only if the term relates to these 5000K fluorescent lamps with the deluxe white phosphors and not also to the triphosphors 850 and 950 fluorescents.
Plain carbon arcs (Not the ones for cinema projection): haven't a full spectrum, when most of the light comes from the arc (Carbon lines), but only when most of the light comes from the electrodes, when the electrodes are too close each other.
Carbon arcs for cinema projection, xenon flash tubes, HMI lamps and daylight rare-earth MH lamps, have very high density of spectral lines and over 90 CRI, and considered good approximations to full spectrum. However their spectra still considered a linear spectra and not full spectra.
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@Jace yeah I told them about LG and Here too!:)
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I removed the insulting text, from my first message and replaced it with a message that notes that it contained an insulting that was removed.