getting lighter color

[AGBrewer]

I have heard that if you wait to add some of the extract till the last 15 20 minutes of the boil the wort will be a lighter color due to less caramelization, Would it be ok to add all of the extract later in the boil to achieve a very light color? Problems? How late can you go?

 

[NOVA Brewer]

https://www.homebrewtalk.com/showthread.php?t=22335

Lots of good resources in that thread.