DETAIL ITEM AS FOLLOWING: 1,35W,70W,100W,150W,250W,400W,600W(one ballast can fire one bulb) 2,70WX2,100WX2,150WX2,250WX2,70WX2(one ballast can fire two bulb) 3,70WX3,100WX3,150WX3(one ballast can fire three bulb)