The Mavic 3 might be a good choice .
What is it exactly that your going to be carrying under the drone. ?
Here is mavic 2 carrying a life Vest weighing close to a pound.
with a drop system .
Start at 1: 36
Phatromrain.org
Gear to Fly...
If you only have 1 light and you want to get the best bang for your efforts , I recommend you use a compression band and place the Light on a tilt so you can see it from the ground as well as from the top, This give you so much more coverage...