DamonHDFunny you say that. I called he wanted to know if I was still interested it the position. AND yes they are hiring.
I would LOVE to jump, but alas the pay is too far below my minimum
. Perhaps in the next 1/2 dozen years when I'm in retirement mode
Now , for the question at hand:
The 24Vdc bulbs can handle anything as low as 20Vdc and as high as 28Vdc. At 21V you'll see crazy high current needs during the on-rush (turn on) IF they even come on. This is a bit complicated as it depends on the number of LEDs in the bulb or strip. The 29V is just as complicated as you're pushing against the forward voltages of the LEDs themselves.
OF course, depending on how far the battery setup is from the lights, the higher voltages might not be a real issue, but the lower one certainly will. Line loss even for 24Vdc systems can be a factor.
Their marine bulbs are built with battery charging regimes in mind.
ArmadilloWe might need a little more information on your setup to better help. Distances from batteries to closest light and farthest light. Battery types , wire size (though I think you said Romex )
Here's hoping this helps
Bruce S