I think this could solved your problem.. All you have to do is to design a constant current configuration that will supply the 9 LED at 36V. Just post your circuit for us to review..
To generate 0.7A output current @36V you will have to employ something more substancial, something that can switch at least 6A at 5V input ..
Try the LT1170 ..
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I Agree with IanP need a little more robust design. You may want to look at
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they have an interactive tool that you can design your needed circuit on the web and it will give you the schematic and a bill of materials at the end with manufacturers and part numbers.