Paco , I'm not getting the 30" part , but that spot/flood light should do good.
It bolts on 3/4" hole 2" ball, I was going to put the ball in the bucket but couldn't see it, the cross piece evans out the wait a little . This was just a quick solution for moving trailers around easily.
Oh yea, I'm a knucklehead sometimes. The lamp is not shown in the post, but its a typical articulating lamp commonly found on lathes. I'll post up some pictures once I mount the lamp. I'm replacing the short snake type lamp that came on the lathe. This is the light I purchased on eBay.
A-L101A IP65 Waterproof 70W Halogen Work Light w/ 32" Arm 24V Machine worklight
What convertor are you using to get the 12v ac? Does it use the 220v supply? My lathe came with that same light and an upgrade to LED would be a good mod.