Humidity

Does anyone know the necessary humidity for spruce and for mahogany? I just bought a Kala KA-SC Spructop Concert Uke with mahogany back ans sides. Thanks.

I haven't ran across or seen anything for specific type woods, just humidity in general regarding solid wood. They pretty much say 45-55% humidity is about right. Also check this thread if you haven't already. Couple other links to check out

http://uketalk.com/ukestories/page7.html
http://www.stefansukulele.com/index.php?option=com_content&task=view&id=15&Itemid=43