Digital BW, The Print

I would like to build a viewing box. My office is windowless and I
keep it fairly dark when I am printing or working in Photoshop.  I 
think I have heard that you can buy day light balanced florescent 
bulbs. If so, It seems like you could just buy a fixture at Home Depot, 
build a wooden box, wire it up and away you go. 

Although, how would you know if the box was to big or to small for
the light source?

If you can buy day light balanced florescent bulb were is a good 
source?

Any suggestions or recommendation would be appreciated.

Thanks Steve