In my opinion, yes the Legend is brighter than the Eclipse. I don't really have any technical data on their board but we had one in shop and our Deck blew that one out of the water.
I wouldn't think the Saitek board uses the same LEDs we do. That keyboard has a much lower profile and probably uses surface mount LEDs. We use 3mm through-hole style LEDs that are taller but still fit into our keyboard due to its design. Something also to note regarding the height of these keyboards - because the Saitek is lower profile, it means it has a more laptop-style construction meaning it will break way before any Deck would. Their keys also rub off, which is not a problem for Deck keyboards because our ink is right in the plastic of the keycap and can't come out ever!
For technical data on the LEDs used in our Deck keyboards, please visit this page: