Resin with low weight for drone parts

I plan on printing several drone parts using an SLA printer (Anycubic Proton Mono X 6K). It will mainly be small gimbal parts that won't be exposed to impacts or high mechanical stress. However, they should have the following properties:

1. Low weight. I've printed these parts with ABS on a FDM printer before and they seemed to be lighter than their resin counterparts (I tried Sunlu ABS-like resin). This goes even for casing parts with no inner hollow areas.
2. Stable to outside conditions I'm not too worried about UV light, as this should (hopefully) be addressable with an UV repelling coating. But the drone also needs to withstand rain and rough weather conditions (here in germany, that would be around 30 to -10 degrees).

Could you recomment a suitable resin that meets the above conditions? I'm especially interested in the weight of the resin, as this property usually isn't addressed by anyone, not even the manufacturers.