Doug,

Aristo is no more. You can probably get information from Voltrac ph: 1-203 799-7877 (Louise Kessler ext. 3163) or
email:louise.kessler@voltrac.com

They apparently took over Aristo products. A year or so ago I needed new bulbs for Arist VCL4500 and that's who I dealt with.

http://www.jeffreyglasser.com/