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Re: trouble lighting orange
Posted By: Sean S In Response To: Re: trouble lighting orange (SVP Neon Equipment)
Date: Friday, 13 October 2006, at 2:22 p.m.
"Personally, I probably would have used a green color filled with red gas for various reasons. But that's just me and I would need to see the specific color of plastic before making a final decision about the choice of neon color."
I did that and learned that it produces a tangerine look to the plastic and if there is any red letters near it will look red. The same as putting a stick of Tangerine Accuwall next to Ruby Accuwall, they will look almost the same.
> I agree with the basis of Gavin's and Sean's
> response. To expand on this, colored plastic
> acts as a filter much in the same way as
> colored (classic) glass does: It filters out
> the unwanted portions of the light spectrum
> (wave lengths) produced by a particular
> light source, in this case neon. For
> example, ruby red filters out almost
> everything from the gas discharge except the
> red spectrum. That is why filling an
> uncoated ruby red tube with argon/mercury
> produces very little light: Because there is
> very little red spectrum in the
> argon/mercury discharge and all the
> blue/green/violet is filtered out and not
> tramsmitted through the glass.> In the same way, colored plastic has a
> tendency to filter out the portions of the
> light spectrum (wave lengths) that it is not
> intended to transmit. In the case of orange
> faces, most of the spectrum except what is
> close to the orange band is filtered out.> Standard phosphor 6500K white produces very
> little red/orange color. That is the main
> reason why it is a poor choice for an orange
> (or other warm color) plastic face. 6500K
> tri-phosphor produces a little more
> red/orange spectrum because of the phosphor
> blend used. But it is still not enough to
> properly illuminate an orange face IMO. On
> the other hand, a tri-phosphor 2800K or
> 3000K white has a much higher percentage of
> light in the red/orange spectrum, so it is a
> much better choice for a warm color plastic
> face. If you went with an even warmer white,
> say 2400K, you would get even more
> red/orange saturation of the plastic.> Personally, I probably would have used a
> green color filled with red gas for various
> reasons. But that's just me and I would need
> to see the specific color of plastic before
> making a final decision about the choice of
> neon color.> There is more to consider too. Different
> manufacturers plastics, even though they may
> appear to be the same color, transmit the
> desired wave length of light better than
> others. Plus, there are now plastics
> specifically made for illumination by LED's.
> They are engineered to transmit the
> particular wave lengths of light produced by
> a specific color of LED. Neon colors are
> usually more forgiving than this because a
> specific color produces a broader spectrum
> of light than an LED color does. So the
> higher priced special plastics are not
> typically required when using neon for
> channel letter face illumination.> Mark
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