buff,
They are not going to lay all year whether you use lights or not. There are going to be breaks as their bodies need rest. The lights only delay the time of the rest.
For example, where I live it is very hot during the summer when there is the most light. My birds usually do not lay from mid-July until mid-September. So, even though this is the time of the most light the birds naturally take a rest during this time.
Nature has programed the birds genetically to know when it is time to lay and when it is time to rest. I'm just suggesting that you'll have healthier, longer lived, longer productive birds if you follow natures course instead of trying to invent a new one.
At last, they are your birds. Raise them as you deem fit. Personally, I like my birds to still be laying when they are 5 and 6 years old, but that is just me.
saladin