Mektronic Engg. Co. Offers Cold Light Fountain with In-built Heat Filter. Mektronic Engg. Co also manufactures various types of medical and surgical instruments. The Cold Light Fountain with In-built Heat Filter, Model Halogen 250, is used for Arthroscopy. The Cold Light Fountain with In-built Heat Filter has Dual light system. The Cold Light Fountain with In-built Heat Filter has manual light intensity adjustment with approximately colour temperature of 3400k. The Cold Light Fountain with In-built Heat Filter has bulb changer switch with water resistance panel. The Cold Light Fountain with In-built Heat Filter has in-build voltage control rectifier.