diff --git a/frontend/ui/device.lua b/frontend/ui/device.lua
index da9d2ed4c..5bfd2a433 100644
--- a/frontend/ui/device.lua
+++ b/frontend/ui/device.lua
@@ -8,13 +8,17 @@ Device = {
 	frontlight = nil,
 }
 
+BaseFrontLight = {}
+
 KindleFrontLight = {
+	min = 0, max = 24,
 	kpw_fl = "/sys/devices/system/fl_tps6116x/fl_tps6116x0/fl_intensity",
 	intensity = nil,
 	lipc_handle = nil,
 }
 
 KoboFrontLight = {
+	min = 1, max = 100,
 	intensity = nil,
 	fl = nil,
 }
@@ -187,6 +191,12 @@ function Device:getFrontlight()
 	return self.frontlight
 end
 
+function BaseFrontLight:intensityCheckBounds(intensity)
+	intensity = intensity < self.min and self.min or intensity
+	intensity = intensity > self.max and self.max or intensity
+	self.intensity = intensity
+end
+
 function KindleFrontLight:init()
 	require "liblipclua"
 	self.lipc_handle = lipc.init("com.github.koreader")
@@ -206,12 +216,12 @@ function KindleFrontLight:toggle()
 	end
 end
 
+KindleFrontLight.intensityCheckBounds = BaseFrontLight.intensityCheckBounds
+
 function KindleFrontLight:setIntensity(intensity)
 	if self.lipc_handle ~= nil then
-		intensity = intensity < 0 and 0 or intensity
-		intensity = intensity > 24 and 24 or intensity
-		self.intensity = intensity
-		self.lipc_handle:set_int_property("com.lab126.powerd", "flIntensity", intensity)
+		self:intensityCheckBounds(intensity)
+		self.lipc_handle:set_int_property("com.lab126.powerd", "flIntensity", self.intensity)
 	end
 end
 
@@ -230,11 +240,11 @@ function KoboFrontLight:toggle()
 	end
 end
 
+KoboFrontLight.intensityCheckBounds = BaseFrontLight.intensityCheckBounds
+
 function KoboFrontLight:setIntensity(intensity)
 	if self.fl ~= nil then
-		intensity = intensity < 1 and 1 or intensity
-		intensity = intensity > 100 and 100 or intensity
-		self.fl:setBrightness(intensity)
-		self.intensity = intensity
+		self:intensityCheckBounds(intensity)
+		self.fl:setBrightness(self.intensity)
 	end
 end
diff --git a/frontend/ui/reader/readerfrontlight.lua b/frontend/ui/reader/readerfrontlight.lua
index 7278f06e1..7b60f1ec0 100644
--- a/frontend/ui/reader/readerfrontlight.lua
+++ b/frontend/ui/reader/readerfrontlight.lua
@@ -26,7 +26,7 @@ function ReaderFrontLight:init()
 end
 
 function ReaderFrontLight:onAdjust(arg, ges)
-	local fl = Device.frontlight
+	local fl = Device:getFrontlight()
 	if fl.intensity ~= nil then
 		local rel_proportion = ges.distance / Screen:getWidth()
 		local delta_int = self.steps[math.ceil(#self.steps*rel_proportion)] or self.steps[#self.steps]
@@ -59,17 +59,17 @@ function ReaderFrontLight:addToMainMenu(tab_item_table)
 end
 
 function ReaderFrontLight:onShowFlDialog()
-	DEBUG("show fldial dialog")
+	local fl = Device:getFrontlight()
 	self.fl_dialog = InputDialog:new{
 		title = _("Frontlight Level"),
-		input_hint = Device:isKobo() and "(1 - 100)" or "(0 - 24)",
+		input_hint = ("(%d - %d)"):format(fl.min, fl.max),
 		buttons = {
 			{
 				{
 					text = _("Toggle"),
 					enabled = true,
 					callback = function()
-						Device.frontlight:toggle()
+						fl:toggle()
 					end,
 				},
 				{
@@ -100,13 +100,13 @@ end
 
 function ReaderFrontLight:close()
 	self.fl_dialog:onClose()
-	G_reader_settings:saveSetting("frontlight_intensity", Device.frontlight.intensity)
+	G_reader_settings:saveSetting("frontlight_intensity", Device:getFrontlight().intensity)
 	UIManager:close(self.fl_dialog)
 end
 
 function ReaderFrontLight:fldialIntensity()
 	local number = tonumber(self.fl_dialog:getInputText())
 	if number ~= nil then
-		Device.frontlight:setIntensity(number)
+		Device:getFrontlight():setIntensity(number)
 	end
 end