Digital BW, The Print

BTW I did not realise that the Van Gogh museum in Amsterdam was lit with
these.  I remember visiting the museum last year and thinking it was
incredibly well lit with an amazing sense of clean bright light for an
indoor space.  I can't wait to get these things up and running in my home.
I got a couple of "daylight" bulbs from my local hardware store to try. They
are meant to be 4100K.  I replaced the two lights over my desk - they are
about 1 1/2 feet to my right and left and the desk to ceiling length is
1.6m.  Unfortunately one is producing light very different from the other.
As measured by my i1, one is producing 3900K and the other only 3100K (with
a big difference in lux as well).  But even with these two poor bulbs it is
freaky to see the impact on the room which is around 4x9m lit with 11
halogen ceiling lights.  It is somehow more relaxing to have the whiter
light around my desk.  The rest of the room now looks very very yellow!!  So
I would not recommend a partial bulb replacement.  It's no wonder they
prescribe these bulbs for seasonal affective disorder.  Given the typically
grey English winter I'd say these are a must for any halogen-lit English
home - forget about whether you are a photographer or not.