a cheap light fixture well i would get one of these if you dont mind spending the money
http://cgi.ebay.co.uk/Aquamedic-150...3?pt=UK_Pet_Supplies_Fish&hash=item45f8b84729
or if you want to save some $$$ get one of these
http://cgi.ebay.co.uk/400w-Metal-Ha...693?pt=LH_DefaultDomain_3&hash=item2a0d901495
made for hydroponics and simply take it apart and remove the fixture from the cheap metal casing then install it into a canopy you can make one or buy one the canopy should be suspended on chains either from brackets in the wall or from a custom frame
woww i would hate to to think what a halid would do on 24/7 in 10gs of water no they should be on between 6-8 hours a day to stimulate natural sun shine and corals and anemones need this basically light is the life suport machine of a coral or anemone
how can you tell if its an eclips 12 well look at a pic of an eclips 12 on the net and compar it to your tank but i would imagine if it was an eclips 12 it would say like eclips 12 on the hood or near the base
16x8x12 works out as 6.65 us gallons way to small for a pair of clowns if your a beginer i kept a pair of clowns in a fluval edge but it had ex filtration and i done 2 30% changes a week so i would go with the 10g that would be plenty of space for a pair of percular or common clowns
anemone no no for a begginer i killed 3 anemones when i first started because i jumped in but that was a long time ago so i really would suggest keeping away from them till your more expereinced i have 3 in my tanks at the moment and they really are a pain when it comes to maintance and water quality
percular or common clowns that have been captive bred dont need anemones to host as you dont miss what they havent had

even wild caught clowns have been successfuly kept with out them and also most will host a fake anemone yes a fake one or some corals