On Tue, 25 May 2004 12:52:53 -0700
"Hal V. Engel" <[EMAIL PROTECTED]> wrote:
> In addition you need to consider not just the color temp
> of your illuminant but also it's CRI (Color Rendering
> Index) - how close it's overall spectrum is to sun light.
> CRI values should be 85 or higher - 100 is perfect and not
> attainable. Most incandescent lights have CRIs in the 50s
> and low 60s. Most florescent lights have CRIs in the 60s
> and low 70s.
>
> There is one bulb, a low voltage halogen Solux MR-16, that
> has a CRI 99.35 and a color temp of 4700K. This bulb is
> highly regarded. It is inexpensive but needs a fixture
> that supports an MR-16 bulb.
>
> The most easily obtained D50 bulbs are the Philips compact
> florescent bulbs which can be gotten at Home Depot and
> other places. These have a CRI of 85 and cost about $15
> each for a 50 watt output bulb. These only come in 50
> watt output. There are other more expensive compact
> florescent bulbs with CRIs as high as 92. But these are
> not available locally and must be ordered. In the T8, T10
> and T12 type bulbs you can find CRIs as high as 97. But
> again these are hard to find and tend to be expensive.
> These are usually not avaliable locally.
>
> --
> Hal V. Engel
How about the Sylvania CFLs? Do you know where I could find a CRI
rating for them? Subjectively I've been impressed by their sunlight
like color compared to other CFLs and house hold incandescent bulbs,
but I don't have a way of testing them objectively. I don't remember
if I tried any Philips CLFs. I think I may have tried a Philips
capsule CFL.
--
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