I used these power extension cables for the Lighthouses. The barrel connectors fit well and the Lighthouses work fine with them. They’re white for blending with walls and flat which allows you to install them flush.

2 Pack DC Power Extension Cable 20ft 2.1mm x 5.5mm Compatible with 12V DC Adapter ... https://www.amazon.com/dp/B07QXKHHV8/ref=cm_sw_r_sms_c_api_i_Dn4bEb16E8XY6

Stuff I'm using...

These two controller charging stands designed by /u/BearCubTeacher

https://www.thingiverse.com/thing:3744655

https://www.thingiverse.com/thing:3751848

Both available printed from /u/Zenyth3D:

https://www.etsy.com/listing/744857671/magnetic-charging-stand-for-valve-index

https://www.etsy.com/listing/707556478/valve-index-magnetic-charging-stand-slim

These are best used with cables with magnetic attachment recommended by /u/BearCubTeacher:

https://www.amazon.com/gp/product/B07HBZ3ZH9/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1

Dual USB charging adapter for the controllers:

https://www.amazon.com/Charger-Anker-Foldable-PowerPort-Samsung/dp/B07DFWKBF7/ref=sr_1_1?keywords=dual+usb+charger+anker&qid=1577428444&sr=8-1

Base station wall mounts (more compact and less visible than those that come with the Index):

https://www.amazon.com/gp/product/B00R96X9DS

Base station power cable extensions:

https://www.amazon.com/gp/product/B07QXKHHV8/ref=ppx_yo_dt_b_asin_title_o05_s00?ie=UTF8&psc=1