Here's a similar buyer's guide list I did in Spring of last year. These are quick Amazon.com links and prices to the products I use already, or would buy if I was looking to upgrade. This list is intended for people looking for great products used in low-light photography.
Sony a7riii - $3,198 (body only) - Top dog among consumer mirrorless options, it has all the important features that pro/consumer photographers and video creators wanted - 4k video, great in low light, super dynamic range, and much better battery life than it's predecessor.
Nikon D850 - $3,296 (body only) - Top dog of the tried and true camera brands, top ratings also.
Canon EOS 5D Mark IV - $3,200 (body only).
Olympus OM-D E-M5 Mark II - $800 (body only).
Sony A6000 - $500 (with 16-50mm lens).
Nikon 14-24mm f2.8 - $1,696 - Big and heavy, but beautiful.
Canon 24-70mm f2.8 - $1,700 - Good versatility.
Rokinon 14mm f2.8 (for Canon) - $189 - Cheap and good, what a combo!
Neewer 66in Carbon Fiber Tripod - $95 - Carries up to 26lbs.
4. LED Lights:
Night-Writer Kit - $65 - I use this for drawing detailed light-lines during a long exposure.
SOLARAY PRO ZX-1 - $50 - High power / rechargeable LED for casting light and getting a focus.
LED Filters & Adaptors - lightpaintingbrushes.com