Wiring harness for headlights

So looking at getting these roundeyes replacement http://www.roundeyes.com/Toyota_Headlamps-Rectangular_Toyota_Conversion_Headlamps.html
but in researching them I have read that the old wiring harness for the stock headlights cant handle( or wont put out the full potential) of these lights.
I cant seem to find anything about this replacement harness or if I really need it as most the info pretty vague or about lights for a older model.My truck is a 95. Anyone have any idea or experience with this?

 

Or are these what I want plus the upgraded harness below on the page.
http://www.rallylights.com/detail.aspx?ID=744


Wiring harness for H4 bulbs. Just putting it on here cuz I wanna keep track of where I can get it if its what I need.
http://www.automotivelightingusa.co...ircuit-performance-h4-heavy-duty-harness.html