The Luma 3 frame is compatible with a wide variety of components the following are the components we've been running and testing the frame with.

The Luma 3 was specifically designed for 6s, there's no reason why you cant build it with 4s parts however you can expect some trade offs in flight times and thrust.. 

Digital Build.

Caddx Vista (DJI Camera) - Select "Mini" Luma 3 FPV Camera mount option

  

Receiver.

TBS Crossfire Nano RX (SE) - if using the standard "Immortal T" rear mount

TBS Crossfire Nano RX (STD) - if using the "Immortal L" rear mount

ELRS/Tracer/Ghost are all good too - select an Immortal T rear mount

 

6S Motors.

Axis Flying AF223 12x12mm 2203.5 2910KV

 

Flight controller and ESC.

20x20 Stack

 

Props.

HQ 75mm Cinewhoop prop

Gemfan 75mm Ducted prop

The Luma 3 frame is compatible with all 3" props up to 3.1"

Batteries.

850 - 1000mah 6s