This is what I would do. I'd definitely take both bulbs back and get a refund.
Then I'd look into getting a Mercury Vapor Bulb. I use the PowerSun bulbs made by Zoomed. These bulbs produce everything you will probably need. They put out heat (UVA) and UVB (necessary to produce D3 which makes calcium useable in reptiles).
With that tank I think the 100W would do the trick. You can get these bulbs online. I usually buy most of my supplies at www.bigappleherp.com but you may be able to get the bulbs cheaper somewhere else, I honestly don't know (shop around).
There are other MVB manufacturers out there and I think one of the best ones are made by vitalite. Check out this forum link.
MVB User Forum
Keep in mind with these MVB bulbs it may be necessary to buy an additional heat source. Some people say they don't get enough heat out of the MVB's. If that's the case any old incandescent near the MVB might do the trick. You will need to use the MVB first to see what kinds of temps you can generate.
Some people may tell you it is not necessary to use a bulb that produces UVB. They will tell you if you use a calcium supplement with vitamin d3 in it you'll be fine. My opinion on that is better safe than sorry. If you use a UVB producing bulb you give the reptile the ability to regulate it's own production of D3 while if only using supplements with d3 in them you are regulating that yourself. Overdosing or underdosing with vitamin D3 can be dangerous. Leave that to the experienced keepers. Just thought I'd stick that in here since we're talking UVB anyway.
Hope this helps!
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Rob Talkington