increase headlight wattage by tapping into battery?

I saw these online and was wondering if they were any good. They maximize wattage of your aftermarket lightbulbs by tapping the light bulbs directly into the battery. I saw it on this website
http://www.autobulbdepot.com/fr_prodindex.tpl?cart=30807297171491185
has anyone tried these?

Thanks in advance

D
:flash: