First, let me tell you about links. In the second row of tool buttons (just above the smiles) on the left there is a globe with sometihng stuck to it... When you post a link, click on that and enter the info in the box, then enter what you want me to see in the next box that comes up and then it will be a link, else it's just text.
They have a wide assortment of ballasts including one that is 40 watt (2 20 watt bulbs) and another that is 40 watt (one 40 watt bulb) and yes, those bulb numbers are standard, same as I use in my kitchen.