Hey, did you change your design from the pictures on the website? I think the LED's you purchased could get a lot brighter with a few simple modifications.
First, use resistors designed to handle several watts of electricity, it appears as if you're using 1/2 watt resistors. Additionally you could use a lower gauge wire connected to a source capable of pumping 3+ amps of juice out. As a final step, place heatsinks on those mugs! The LED's and MOSFETS should each be placed on a large piece of metal or have heatsinks placed on them.
Regards,
Brian