Im guessing its a bmp if its too big ... load it in photoshop or any other image software and then save it as a JPG/jpeg
if it's already a jpg load it up in any photo editing softare and crop it, that is to say drag a box around the part that counts, select copy and then paste that into a black canvas and save that (as jpg).
Where did you buy it from, and whats it called ?
im looking at some kit now but it costs loads, Im going on budget and only really can afford to spend the extra on a good light.
Check this ...
http://www.growell.co.uk/p/1319/Trop...ng_System.html
It says it senses when it's getting dry and auto sprinkles... crazy eh ? not sure if I would trust a darling plant with AI tho.