Multiple Hue bridges

Does anyone have experience with multiple Hue bridges in HA? I’m hitting the limits of my Hue bridge with 40 lights, 6 switches and 4 motion sensors.

Hi
Yes, more info here:

I’ll be doing this shortly. I’m starting to get weird behavior on the hub. I have 63 devices listed in it so I am going to buy a second (gen 1) hub and add it to the configuration. I am hoping it all just goes smoothly.

The HUE component seems to support the use of multiple bridges. There is a config setting for that:

filename (Optional): Make this unique if specifying multiple Hue hubs.

But: what filename ? Can I just make up a filename ?

So I’v added:

filename: /home/hass/.homeassistant/phue.conf

But this gives an error:

17-02-11 09:17:50 INFO (MainThread) [homeassistant.components.light] Setting up light.hue
17-02-11 09:17:50 INFO (Thread-5) [phue] Attempting to connect to the bridge...
17-02-11 09:17:50 INFO (MainThread) [homeassistant.components.light] Setting up light.hue
17-02-11 09:17:50 INFO (Thread-5) [phue] Using ip: 192.168.178.123
17-02-11 09:17:50 INFO (Thread-5) [phue] Error opening config file, will attempt bridge registration
17-02-11 09:17:50 ERROR (MainThread) [homeassistant.components.light] Error while setting up platform hue
  File "/srv/hass/lib/python3.5/site-packages/homeassistant/components/light/hue.py", line 128, in setup_platform
    allow_in_emulated_hue, allow_hue_groups)
  File "/srv/hass/lib/python3.5/site-packages/homeassistant/components/light/hue.py", line 139, in setup_bridge
  File "/home/hass/.homeassistant/deps/phue.py", line 629, in __init__
  File "/home/hass/.homeassistant/deps/phue.py", line 753, in connect
  File "/home/hass/.homeassistant/deps/phue.py", line 707, in register_app
  File "/home/hass/.homeassistant/deps/phue.py", line 666, in request

Any thoughts ?