Royal Ontario Museum has a good system to maintain RH% in showcases.
If the lighting system is affecting the temperature you should look into a
High Efficiency Lighting system that would considerably reduce the IR
component.
Alexander Meadu
McMichael Canadian Art Collection
Kleinburg, Ontario, L0J 1C0
Canada
Tel. 905 893 0344 ext.215
Fax. 905 893 2588
E-Mail [log in to unmask]