Really like this idea as I have a similar desert landscape. Where did you get that fixture do you have a product link for it?
You can do a search for BL1-AL and you should be able to find it. It’ll be made by Hadco or Phillips. I happen to come across a few of them on Craigslist and luckily the camera fit in there nicely. Just try to find any large bullet flood spotlight and it should work. Hope that helps!