Hello
first off i love my coralife light!!!! it was a used reef setup when i got it covered in salt and half dead but cleaned it up and it work great!!!
I dont use the moon lights anymore to unnatural looking for me.
no you don't have to go with the bulbs that came with it. i have 2x6700k 2x10000k in mine.
here are some links i have for lights
http://www.ahsupply.com/bulbs.htm
http://www.championlighting.com/home.php?cat=409
http://www.innovativelights.com/bulbs1.html
http://www.marineandreef.com/
http://lightbulbsdirect.com/Merchant...de=F55BX-AR-FS
Big als has 8000k all glass brand bulbs for like $16 if i had some cash i would go for those instead of my 10000k
or these http://lightbulbsdirect.com/Merchant...de=F55BX-AR-FS i here the color for plants with these 9235k or the 8000k is amazing!
you can use 55watt or 65 watt as long as its the correct pin configuration is present coralife is normally like this (....) not this
Good luck
Jeremy