There isn't any increase in light. It just changes the beam pattern. Some people like it, but I don't think it's worth the extra $ for an off road application. Just aim the lights where you want them. My .02
DDM's customer service sux balls as well. However, my hid's are awesome.... I got them from another member and would never order from DDM after I delt with him. Its a good product though if you dont care about the customer service.
Take a look at the Burkes they have a halogen low beam and 55w hid high beam, plug and play excellent product, fast shipping excellent warranty give em a look, I have them I love them ..no melting problems.