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I've just uploaded v2.25 of CF.lumen to Google Play, it should start updating shortly. Note that a driver update is needed, so open the app after you update. 

Alternatively, the file is already available in the XDA thread, including the short-form changelog: http://forum.xda-developers.com/showthread.php?t=2711912

A lot of i's have been dotted and t's crossed, fixing some annoyances, fixing some bugs, and filling some feature requests. Following is a description of the most important (but by no means all) changes:

Filter fading

The largest visual change and one of the most requested changes is that filters are now faded in and out, instead of being applied directly.

The fade duration is of course configurable through an option, and the distinction is made between sunrise, sundown, sleep mode and light sensor initiated filter changes.

Wake from sleep

An option was added to automatically go from sleep mode to sundown mode based on the light sensor, during sleep hours. So when you turn on the light, your screen does not stay red. This does require your light sensor to be sensitive enough to register the difference.

Notification options (Pro)

If a filter is currently applied, the default action for the notification when you tap it is to disable or re-enable the filter, instead of opening the control app. This is the most used function of the notification, and now you no longer need to expand the notification to get at that button.

Additionally you can now configure the notification's icon to be hidden or to be shown only when a filter is applied.

Quick toggles

The options menu from the app's main screen now has buttons to disable/enable the current filter and sleep/wake. (This functionality is also available from the notification tray if you have Pro)

Theme switching

Personally I like the white theme (Holo Light), but not everybody shares this opinion. So I added the option to switch between Holo Light, Holo Dark, and the Device Default theme - the latter makes the app integrate with your OEM's skin.

Future plans

There are really only two major points left on my to-do list:

• Backlight/brightness control, configurable with the filters. This is at the very top of the list to investigate and implement

• Remote control (Tasker specific, public API, widgets, homescreen shortcuts, etc). A lot of you are asking for this, and it will come - but there is an order to things, and I want to see about brightness control first, to prevent releasing an API that anyone can use, and then having to massively change it the very next update.

Spam

I've gotten a lot of positive feedback on this app, and see a lot of enthusiasm from those I have shown it to. It is however a fairly niche app, so I definitely appreciate it if you help spread the word :)