light is usefull in every tree 
 i have a hybrid 1:2 bow, i use cold imbue (i have pacheon/cold/light/30 fire (started it at 90 cap)) 
nuking with a bower doesn`t seem very smart to me, the range is a little bit better but 1 arrow skill and 1 nuke and you will take hits, 1 nuke however kills mobs instant (well, depends on what mobs you grind but you can't take much dmg as full int) 
for a nuker... i should go s/s or spear.. i don't see purpose for nukes in a bower build, nor for bow skills in a nuker build.. lol 
 i'm just sticking with the bow skills 

 works nice 

 crits aren't very effective but i do more dmg overall as a str bow 
 i took the cold imbue because it is fun to annoy people in pvp (yah annoy, i s*ck in pvp 

 but i can waste loads of pills of other people, more and more people aren´t frozen/frostbite immune anymore.. 

) 
dmg isn´t the most important and the build i have is a pretty stabile build 

 range = great, kills fast, frozen/frostbite pt mobs (so i take less dmg (less HP)) 
if a mob who is to high comes close... just use frozen/frostbite skill and the grasswalk run 

 works every time 
