The "original" SWITCHABLE ballast!

Independent test studies have shown that plant growth under metal halide light in the early stages of growth with high pressure sodium in the later stages are consistently healthier, larger and have more fruit / flower weight than plants grown under metal halide or high pressure sodium exclusively. The switchable ballast easily facilitates this process.  Just insert your favorite metal halide lamp and change the switch position to "MH" position. When it's time to change over to HPS simply take out the MH lamp, insert the HPS lamp and change the switch position to "HPS" and turn it on. Because the fixture can use standard lamps instead of conversion lamps the grower benefits two ways:

1) MONEY SAVINGS - standard lamps cost about half as much as conversion lamps.

2) MORE LUMENS - standard lamps have a better lumen output than conversion lamps.