Why not use the 50/50 bulbs?
Anyway,
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[IMG]http://www.amazon.com/gp/aw/d/B0002AQ3TK/ref=mp_s_a_1_8?qid=1378939212&sr=8-8&pi=AC_SX110_SY165">Coralife 05492 Actinic Straight Pin Compact Fluorescent Lamp, 36-Watt:Amazon:Pet Supplies@@AMEPARAM@@http://ecx.images-amazon.com/images/I/311nbngUWqL.@@AMEPARAM@@311nbngUWqL</a>
Free shipping (over $25??)