Initial code import. A clean, working mod.

README.md

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-# minetest-bright_night
-Minetest mod - Seamlessly overrides night time sunlight level for all players to provide more visibility outdoors without affecting cave lighting or gameplay.
+# Minetest mod: bright_night
+Seamlessly overrides night time minimum sunlight level for all players to provide more visibility outdoors without affecting cave lighting or gameplay.
+
+By default the minimum sunlight level is set to 4, but you can change this in the script with some effort. (The transition timestamps need to be recalculated.)
+
+Does _not_ play nicely with other skybox mods at the moment.

description.txt

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+Seamlessly overrides night time minimum sunlight level for all players to provide more visibility outdoors without affecting cave lighting or gameplay.

init.lua

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+-- engine const
+local SUNLIGHT = 15
+
+-- mod config
+local night_light = 4
+local dawn = 0.2049
+local dusk = 0.7882
+
+-- mod active values
+local night_mode = false
+
+-- If you change night_light above, use this command
+-- to calculate new seamless dawn and dusk times.
+--[[
+minetest.register_chatcommand("calc_nightlight", {
+description = "Calculate appropriate time settings for bright_night mod.",
+func=function(name)
+	local player = minetest.get_player_by_name(name)
+	if not player then
+		return false, "Must be run by an in-game player."
+	end
+
+	local pos = player:get_pos()
+	pos.x = math.floor(pos.x)
+	pos.y = math.floor(pos.y + 1)
+	pos.z = math.floor(pos.z)
+
+	local time = 0.5
+	local light = minetest.get_node_light(pos, time)
+	if light ~= SUNLIGHT then
+		return false, "Please stand in open sunlight."
+	end
+
+	time = 0.26
+	while light >= night_light and time > 0 do
+		time = time - 0.0001
+		light = minetest.get_node_light(pos, time)
+	end
+	dawn = time
+
+	time = 0.74
+	light = 15
+	while light > night_light and time < 1 do
+		time = time + 0.0001
+		light = minetest.get_node_light(pos, time)
+	end
+	dusk = time
+
+	return true, string.format('Found dawn and dusk for %d as %.4f and %.4f', night_light, dawn, dusk)
+end})
+]]
+
+local function set_night(player)
+	player:override_day_night_ratio(night_light / SUNLIGHT)
+end
+
+local function unset_night(player)
+	player:override_day_night_ratio(nil)
+end
+
+minetest.register_on_joinplayer(function(player)
+	if night_mode then
+		set_night(player)
+	end
+end)
+
+minetest.register_globalstep(function()
+	local time = minetest.get_timeofday()
+	if time < dawn or time > dusk then
+		if not night_mode then
+			night_mode = true
+			for _, player in ipairs(minetest.get_connected_players()) do
+				set_night(player)
+			end
+		end
+	elseif night_mode then
+		night_mode = false
+		for _, player in ipairs(minetest.get_connected_players()) do
+			unset_night(player)
+		end
+	end
+end)
+

mod.conf

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+name = bright_night