Are there ballasts which can burn both MH and HPS bulbs?
Yes. You’ve got three great Sun System options from Sunlight Supply. The Sun System VI is a switchable ballast, so you can use either Metal Halide OR High Pressure Sodium bulbs. You simply insert the appropriate lamp and set the switch to the correct operational setting. The other two options allow you to burn both types of bulbs at the same time. The Sun VII allows for the burning of both types of bulbs under the same reflector and Sun System VIII burns each kind of bulb under two separate reflectors.
