Only thing I know about Light CMS is that it’s a proprietary and hosted solution. This put me off it, for several reasons.
Primarily you can’t host it with your own service provider, you buy the cms and hosting as package – unlike, say, WordPress or Drupal where you obtain the CMS and then install it in your own web space.
Also, it’s proprietary, or closed-source, which means that you can’t tinker with it (in case it doesn’t quite meet your needs) and more importantly other people can’t tinker with it, so you don’t get the rich plethora of add-ons and plugins that you get with open source software. This doesn’t mean there’s anything wrong with there software, just that I’m more focussed on the open source alternatives at the moment.
It looks like you can sign up for a free demo, so all it would take is a weekend playing with it to decide whether it is a good fit for you and your clients.