Sylvania Skywhite Fluorescent

[a***@general-cathexis.com]

Does anyone have an image or link to a spectral chart for this light? If so, please, post it.

I recently purchased a case of Skywhite 48" T8 bulbs with the following specs.:

32 watts
8000 K
2700 lumens
88 CRI

I am favorably impressed by skin tones under this light. Unlike most daylight types, the Skywhite light seems to have slightly too much red instead of much too much green. I think that, if Sylvania also offered Skywhite in CFL and advertised it, along with the health benefits of high temperature lighting, on TV, they could make a fortune. If and when Skywhite becomes available in CFL, I would replace all of my home lighting with Skywhite.

[Jeff Waymouth]

Try this:

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Jeff Waymouth

Post by a***@general-cathexis.com
Does anyone have an image or link to a spectral chart for this light? If so, please, post it.
32 watts
8000 K
2700 lumens
88 CRI
I am favorably impressed by skin tones under this light. Unlike most daylight types, the Skywhite light seems to have slightly too much red instead of much too much green. I think that, if Sylvania also offered Skywhite in CFL and advertised it, along with the health benefits of high temperature lighting, on TV, they could make a fortune. If and when Skywhite becomes available in CFL, I would replace all of my home lighting with Skywhite.

[Ingo Thies]

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[a***@general-cathexis.com]

Thank you. Apparently, what I misinterpreted as a small lack of green is actually a complete lack of yellow. Isn't the dip at 560 nm unusual in a fluorescent? According to Loading Image..., GE Reveal incandescent also lacks yellow which suggests that people who like GE Reveal incandescent will also like Sylvania Skylight fluorescent. Thus, offering Skylight as a CFL should be a no brainer.

[bud--]

Post by a***@general-cathexis.com
Thank you. Apparently, what I misinterpreted as a small lack of green is actually a complete lack of yellow. Isn't the dip at 560 nm unusual in a fluorescent? According to http://ledmuseum.candlepower.us/33/reveal5.gif, GE Reveal incandescent also lacks yellow which suggests that people who like GE Reveal incandescent will also like Sylvania Skylight fluorescent. Thus, offering Skylight as a CFL should be a no brainer.

Looking at the Reveal halogen, they claim a CRI of 100.
How do you remove the yellow and have a CRI of 100?

http://www.dpreview.com/forums/post/22418166
(digital photography review)
says the CRI is about 70 and "unscrupulous bulb mongers push these
horrible bulbs at many different groups."

For a GE Reveal that is "100W replacement" the lamp is 1120 initial lumens
For an incandescent 100W bulb 1600 is a reasonable lumen figure
Why isn't that consumer fraud?

GE says it uses 28% less energy than regular incandescent
but gives you 30% less light

GE says it delivers outstanding energy efficiency
Reveal - 1120L/72W = 15.6L/W
real incandescent - 1600L/100W = 16L/W
How can "outstanding" be less than an ordinary incandescent?
If you remove yellow why wouldn't that decrease the efficiency?
(unless you capture and use the heat - but I believe the yellow is
removed by the glass)

Looks to me like fraudulent and misleading advertizing.
Am I missing something?

[Ingo Thies]

Post by bud--
Looking at the Reveal halogen, they claim a CRI of 100.
How do you remove the yellow and have a CRI of 100?
http://www.dpreview.com/forums/post/22418166
(digital photography review)
says the CRI is about 70 and "unscrupulous bulb mongers push these
horrible bulbs at many different groups."

I have tested the tabulated (PlotDigitizer) spd of the Reveal buld and
found a CRI of 86 and a CCT of 3600 kelvins, i.e. within the
neutral-white regime. However, I don't know whether the drop at the red
end (responsible to the unusual high CCT) is due to additional absoption
of partial transmission in case of a reflector, or due to inaccuracies
in the measurement setup.

BTW not even standard or halogen incandescents have a CRI=100 since
tungsten is not a perfect blackbody radiator and since the glass bulb
does also absorb parts of the light. However, good incans/halogens
should have a CRI>98 anyway. For example, the truck halogen here

http://www.uef.fi/fi/spectral/artificial-lights

(the first of four artificial light spectra) has, according to the CRI
formulae shown and linked at Wikipedia, has a CRI=98.4 and an R9=94.3.

Best wishes,

Ingo