PowerSwitch

This supplier
http://www.onsolar.co.uk/12V-11W-CFL.shtml

Have recently expanded their range of 12 and 24 volt lighting products.

I have previously used the 12 volt CFLs and can recomend them, they seem as good as the much more expensive ones made by Steca.

A newish product is the 3 watt LED lamp that works on both 12 volt and 24 volt systems, I have tried a couple and been impressed, though durability remains unknown.

I have also tried the 12 volt 1 watt LED golfball lamps in various colours, certainly useful for decorative or night lighting, and just about sufficient for safe movement if extreme economy is required.

The 12 and 24 volt LED floodlights look good, but I have not tried these.

They also have some dual brightness LED bulbs that can be run at either 0.5 watt or at 3 watts, sound useful though again I have not tried these.

I have no connection with the supplier.
Be aware that they are part of a group that also supplies some "adult" goods, and the site might be better not visited from a work PC.

Keep your eyes out for more coming, we are starting to see a shift to looking at power over ethernet and DC/DC systems and drivers.

Yes, power over ethernet though not directly relevent to off grid or standby lighting, will drive the mass production of multi voltage DC to DC converters and related electronics that are useful for LED lighting.

I suspect that low power flourescent lamps are now virtualy obsolete for new installations, as distinct from replacement lamps for use in existing equipment.

I cant see much continuing demand for 12 volt 5 watt CFLs, when a 3 watt LED is similar in light output, lights instantly, operates fine in very cold conditions, and is multi voltage as well.

The multi voltage feature has 2 main advantages, firstly it should lower prices since one item can be produced in larger volumes, and only one item need be stocked by retailers instead of two.
Secondly for the off grid home it makes the lighting of relatively distant outbuildings feasible without having to resort to an independant system or massive cables.
A 24 volt cable feeding flourescent lamps in an outbuilding would probably have be sized so as to limit voltage drop to 5% so as to ensure reliable starting and acceptable light output in cold weather.
By use of these muti voltage LEDs the cable size could be reduced to one quarter or less of that required previously since a voltage drop of 20% would be fine.
The saving by use of 100M of 4.0mm cable instead of a similar length of 16mm is substantial