My redshift config file

redshift.conf

[redshift]
temp-day=6500K
temp-night=5000
transition=1
;gamma=0.8:0.7:0.8
gamma=1.000:1.000:1.000
; Ignore geoclue, does not work, always...
;location-provider=geoclue
location-provider=manual
adjustment-method=vidmode
; Change the `xx` with your current location
; Go to ip8.com to see your lat/long coordenates 
[manual]
lat=xx.xxx
lon=-xx.xxx

; In this example screen 1 is adjusted by vidmode. Note
; that the numbering starts from 0, so this is actually
; the second screen.
;[vidmode]
;screen=1