I would start in the middle of your tank and go from there. Just because they were under a 400watt doesn't mean much to me. Differences could be bulbs at different ranges. How old bulbs were on the 400watt. How old are your bulbs on your fixture.
Yea I would start at the middle and work my way back up to the top of the tank. I actually start all my acros at the bottom of the tank first just in case there lights were less potent. Just in case the 400 watters were pretty far off of the tank or they used a bad ballast or the reflector was not very good. You never know
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