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Usage

After downloading the script, update the displays and profiles arrays:

• to get your displays, run xrandr --listmonitors | awk '{print $4}' ORS=' '
• each profile is a set of red:green:blue gamma output corrections

#!/usr/bin/env bash

displays=(eDP-1)
profiles=(
	1:1:1
	1:.97:.94
	1:.93:.88
	1:.90:.81
	1:.86:.73
	1:.82:.64
	1:.77:.54
	1:.71:.42
	1:.68:.35
	1:.64:.28
	1:.59:.18
	1:.54:.08
	1:.32:.03
	1:.18:.01
)

config="${XDG_DATA_HOME:-$HOME/.local/share}/$(basename "$0" .sh)"
source "$config"
len=${#profiles[@]}
case "$1" in
	"+" )    new_ind=$((ind+1 > len-1 ? len-1 : ind+1));;
	"-" )    new_ind=$((ind-1 < 0 ? 0 : ind-1));;
esac
new_prof="${profiles[$new_ind]}"
for display in "${displays[@]}"; do
	xrandr --output "$display" --gamma "${new_prof}"
done
echo "ind=${new_ind}" > "$config"
echo "${new_prof}"

In your bar:

modules-left/center/right = ... nightlight ... 
enable-ipc = true

In your config:

[module/nightlight]
include-file = /home/username/.config/polybar/nightlight

In your nightlight module file/section:

type = custom/ipc

#your formatting

initial = 1

hook-0 = bash ~/.config/polybar/nightlight.sh -
hook-1 = bash ~/.config/polybar/nightlight.sh +

scroll-up = "#nightlight.hook.0"
scroll-down = "#nightlight.hook.1"
#also available: click-left/middle/right, double-click-left/right

If you have set the $XDG_DATA_HOME environment variable, the script will maintain state there in a file called nightlight. If not, ~/.local/share/nightlight is used as a fallback per the XDG specification. To initialize the state file simply restart your window manager or desktop environment to restart polybar. This will silently error the first time since the file is sourced before it exists but then it will be ok. Click/scroll to move among your various r:g:b profiles in nightlight.sh.