So I understand that this doesn't really apply to the mounting subject, but these are the lights I went with.
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Figure I'll put the two up top, replace the two stock ones on the bottom. This way regardless of attachment being used and whether it is up high or down low, I should be able to see what's going on.
For the back, I was thinking on dead center on back of the canopy and one on the engine cover. The PT-425 with the EH72-2 has the upgraded power dohicky putting out 30 amps @ 12V (360W). I assume this is at full throttle. Each of these lights is stated to be 18W each, so 108W total. I assume these could also be put on a PWM dimmer if necessary, dropping the power requirement if necessary. This would leave 252W for the hydraulic cooling fan, charging the battery, etc. which I think should be OK. I understand this is probably overkill and I may add switches so that the tops, bottoms, and each rear could be turned on/off independently.
For the non-PT owners out there, this tractor articulates in the middle with the ROPS attached to the front section. When going in reverse, the ROPS isn't necessarily pointing in the direction the back half is going.
These pods have a 60 degree beam on them. With each of the front ones offset 15degrees both to the side and down and the rears just 15 degrees down, this is what I'm thinking I could expect.
The light gray is the front half / ROPS canopy pointing to the left, the dark gray is the rear/engine compartment, pointing to the right.