Sam,
I just repaired a job close to your run length, and i used #8 all the way out, the owner was told by the landscape contractor that an electrician could fix it for about $150 well, the wire cost was up there using #8 and i had to dig up all the #14 that the landscape contractor buried, he told the owner they had electrical problems, and that,s why the lights were dim. OH YA!!
Don't forget to check that transformer rating
you may have to size up.

[This message has been edited by LK (edited 04-07-2004).]