Genuinely, positively and absolutely please stop thinking about your lights aside the fact there is too much for the available nutrients including and most importantly co2.
The beamworks units have been run on a number of tanks on the forum without issue, your method of co2 delivery is at question and nothing else. It is in your sub conscience that light is the issue because its banded around across the internet on all the forums where you see algae riddled tanks... spend any time at all looking around forums (i say forums as most 'articles' are out dated) and you will see the successful tanks either have years and years of experience or not so much light.
To give you an idea about where to focus your attention, this tank was 300ltrs 900x750x450 running 2 24w t5 bulbs suspended 80cm above the water line giving maybe 10-15par at substrate (it was pretty dim to look at), sure there was loads of light for photos, but when i ran a halide over it all that happened was BBA appeared due to the fact i couldnt get good enough flow (co2) around the tank due its dimensions.
barb island iaplc 380 by
iainsutherland24, on Flickr
Please, dont go on a fools errant chasing light issues, i spent my first 2 years aquascaping blaming light, i only had a reasonable tank after excepting and understanding that co2 and its distribution is the key, now im still learning how to perfect it.
Paulo is correct that light is needed but please understand that it is your last concern, spend some time reading other post from people who have/had similar issues, read all the way through the threads and youll see that co2 is 99% the answer.
As a forum i think we have spent a lot of time trying to get rid of the old ideas of light being an issue, id hate to see things going backwards in the absence of clive's clear and effective brain reprogramming.
This is a good journal to start you on your way....
http://www.ukaps.org/forum/threads/259l-bookcase-rebirth.19287/