Jo visst går det att dimmra en MH lampa!! Bara man har en elektronsik drossel http://www.sfiligoi.it/acls_en.htm ACLS is an electronic dimmer, patented by SFILIGOI, which can reproduce the sunset-sunrise effect only by using HQI lamps. ACLS allows gradual lighting up and darkening from 0 to 100% and vice versa of the lighting. What are the benefits and advantages of ACLS system? ACLS satisfies all the experts in aquarium field’s requirements because it can reproduce the natural lighting flow: in that way the fishes and corals into the aquarium grow in a spot which is very similar to their natural habitat. ACLS can reproduce the natural biologic cycle of the sun, day/night and the seasons on the aquarium habitat: so the passage from daylight to dusk is very gradual and consequently there is no shock for the animals and invertebrates in the aquarium. The opinion of the experts in field is that the creation of the natural conditions of sun and moon light, and in particular of the moon phases, could help the reproduction of the aquarium guests, especially of the invertebrates. http://www.swedish-growsystems.se/main.html SGS ballasterna är en elektronisk ballast byggd enligt den senaste tekniken för att driva HID lampor.Med dessa ballster kan man spara upp till 20% av elförbrukningen.Man kan även dimmra ner lamporna till 20% av deras effekt om så önskas