Vic,
Thanks for the link
Doug,
Thanks for the offer to check further into your friend's tubes, but it won't be necessary.
I went back to my old neighbour's place this morning where I got the almost-killed me frags. He's running URI VHOs on his 4' and 6' tanks. He needs new tubes soon, so I think we're going to do a shipment together. I'll get 4 50/50s and mix and match them with the Aquasuns and Super Actinics we already have until we get a good combination.