Let us know which bulb version you get... WIth the 6% you need 8-9 inches from the bottom of the fixture sitting on the screen to the branches below it. With the 12% you actually want 11-12 inches from the bottom of the fixture sitting on the screen to the branches below it. So typically you end up needing to lift the fixture off the top to compensate for the distance needed.
But yes that is a quality fixture.