The Maxibright Promax Gold 600W is a 240/400V dimmable ballast that can run all 240V and 400V (E40) lamps currently on sale.
Dimmable to 400W and 500W and with a boost option to 660W, it's soft-start technology automatically detects the wattage and voltage of the lamp and powers it accordingly prolonging the life span of your lamps.
Silent running, it's surge control feature means you can power up multiple units safely.