Digital BW, The Print

Gene wrote:

> They are only the fluorescent tubes that are 
> labeled Natural Sunshine. ...
> 
> The CRI are not known or shown on the CF bulbs.

To qualify for the "Energy Saver" (I think) label the CRI must be at 
least 80, I'm told.


>... I have installed the 5000° K tubes ...

There is an interesting relationship between light levels and color
temperature that is often expressed by a curve called the "Kruithof 
Curve."  As the light level becomes lower, we see warmer light as 
neutral.  A higher temperature light will be seen as cool.  
See http://en.wikipedia.org/wiki/Kruithof_curve 

...
> The usual option for galleries is halogen bulbs 
> that are around 3800°K.

Halogens are becoming too ineffient to be used.  We're going to 
replace ours with the best CF floods or spots we can find.  There are 
a few that advertise rather high CRIs, and, frankly, the artists in 
Gallery Los Olivos seem to be happy with even the Home Depot (est. 
cri = 82) samples I've installed for testing.

One advantage of the CF flood is that they come in varying color 
temperatures.  Because we'll have multiple floods per area, the 
artists will be able to control their own color temperature by 
swapping out, for example, some cool ones for some warm ones.

Paul
www.PaulRoark.com