Good point, Andrew... without Simulate Black Ink and Paper White, the soft-proof is less than useful.
I use the daylight halogen bulbs from SoLux
for viewing. I've been very pleased with them.
That said, sometimes I look at prints in sunlight too! And tungsten, and fluorescent, etc. etc.... knowing how metamerism will affect an image printed with a specific paper and ink combination is very helpful when making adjustments during soft-proofing. And sometimes I end up using a different substrate than what I had originally planned as a result.
It is helpful to know the lighting conditions under which the print is expected to be viewed but not always possible. JP Caponigro says he makes different soft-proof adjustments for different types of lighting. I haven't gone that far, but I do try to find the best all-around balance because I don't usually have control over how my prints will be viewed.