Headlights (100w bulbs for 4000s)

["Richard gann" <Richard_gann@mail.amsinc.com>]

     Yet another headlight question ! I want to spend aprox $50 to upgrade 
     my current lights due to there dismal performance and wondered what's 
     stopping me using 100w bulbs (55w low) I saw at the local parts store 
     for $16 each. I realize that I'll probably need to run a thicker 
     cable, relays ect but can the lens enclosure handle the heat?.
     Should I go with Bosch or use any compatible bulb. If these question 
     have been asked before please point me to the appropriate post and I 
     apologize for repeating myself.
     
     Richard Gann
     
     Denver, CO.
     1986 4000s 152k