super10brss

Just got me a set of Sports... YAY!!! One question here... why is there a need to have 4 relay's.?.?. "A 100 watt bulb draws about 100w/12v=8.5ish amps." right.?.?. and my "stock" bulbs are not 100 watts each sooooo... is it just good over kill to do a relay per light... voltage drop... etc.?.?. Ralleylights.com doesn't show the diode relay anymore... they have a standard "kit" http://www.rallylights.com/detail.aspx?ID=3945 that is a non diode relay... is the diode really that important.?.?. Thanks guys