I have almost similar situation as you do, switching from HPS to LED. Except that I am not moving anywhere and my budget is kinda limited. I did a huge research about LED and I think that in your case Cree CXB 3590 mounted on a big radiator would be the very best solution. If you have money, you can pick up more COB’s and underpower them to get more lumens for a less watts.
I’ve considered the led strips myself, but there are certain disadvantages to them, so I will stick with COB’s.
Cree got handy product characterization tool on their site, where you can look at your setup more closely. I aimed to make as much lumens as 1000 W HPS, and it got me to 12 CXB3590 running at ~2100 mA. If you have unlimited money, you can base you calculations on 1400 mA, and it would be approximately 20 COB’s to make as much light as 1000 W HPS, considering proper cooling (correct me if I am wrong)