If your brackets are the same as I've used, the lamp bracket should be held to the 2 ribs with a couple screws each side. Loosen them off & adjust the aim as needed. If not enough, you could open up the already oversize holes in the bracket a bit more.
 
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Thanks Ralph

More or less what i was thinking . Still not sure it will be enough. That prometheus led landing light by Whelan is some bright!