You have both these lights running same times? Over what size tank is that?
As Byron said earlier Brown algae is superst common in new planted set ups and once you tank balances out this will automatically subside. So I wouldn't worry too much about it. I'd just make sure you have the right amount of light there over you tank (hence my question lol) and run that 10hrs day, use a timer to regulate it super easily and done.
Do you have good plant growth as it is (eg stem plants about ~1" per week) or rather not so great plant growth?