Our ballasts can automatically self-check and add power, let the lamps stay 35W 3000 Lumens. We have upgraded our ballasts to digital ones.The new ballast has intelligence functions to meet different types of bulbs performance. When the bulb voltage is AC 60-150V, the ballast can work properly. And it is wide voltage design, the intelligence ballast can work between 7.5V and 18.5V. It is less lumen loss, after the HID lifetime is over 2200 hours, the lumen still can reach 80% of new lamp brightness. And the new ballast has very good Anti-Electronic disturb function.