I did a search of old post for "lumenarc" on this site.
It seems that Lumenarc III's maybe available from J&L...... but are not on their website.
These US site had some good reviews.
http://www.reefexotics.com/lumenarc.htm
http://www.pacificgardensupply.com/products.asp?cat=2
There is also mention that Lumenmax is quite similar and is available in Canada at many shops. I'm not sure how they stack up to Lumenarcs though.
Cheers,
Vic