Compact light, pleasant light - possibly susceptible to interference?

I looked as flat as possible LED lights for indirect lighting (rear panel), what my throat 2,5 cm (+ terminal) appeared Bioledex LED suitable.
An initially tested LED from the hardware store was too deep (about 4 cm) and 3000 K but were still a little too "white"
The Bioledex LED was delivered by the company. Quinte very fast and has approximately 2700 K a much more pleasant light (like a new bulb).
The slim body is apparently made of aluminum, what should the cooling benefit.
Unfortunately it is no switch, instead a cord switch in the supply line installed.
The installation goes pretty quickly with the enclosed metal retaining clip, but I had doubts whether at head sub-assembly is sufficient (for example under the wall unit) the clamping surface / force permanently.
With a short intermediate connector can connect several lamps "seamlessly".
The supplied cable (3-pole) is about 120 cm long, the additional flexible connection cable and the cable for
"Own connection" are unfortunately only ever about 20 cm (!).
The cables are to (cast) sockets on both sides can be connected, a plastic cover free luminaire ends (current-carrying pins free!) And is necessary!
I am bothered only the very short sockets cable, since one has to equal solder extensions for a permanent installation.
As one would have been at least 0.5 m admit or offer optional long cable to purchase.

The light starts with a minimum delay (estimated 1/3 second).
So far I am satisfied and will buy a number of other specimens.
However, whether 50,000 hours operating time can be achieved, only time will tell :-)

Supplement 23.02.2013
I bought another 6 of lights. The light is but a little colder than a normal light bulb, but essentially ok
First I had the problem that the lamp (visible only in the dark!) Even after still glowed faintly greenish. At first I thought of phosphorescence of used light converter dye or a result of induction or capacitor residual charge. (Swap poles) The solution was to turn the connector: The LEDs obviously very sensitive and light up a bit for the pure concern of the phase without the circuit is closed via the switch. So you have to make sure that the switch interrupts the conductor ("L") (which one can not see directly with a cord switch) :-(

Addendum 10/05/2013
Today is (already?) Failed 1 of lights, although it was little used: Gesamtbrennbdauer far about 1 hour :-(
Something like this should not happen, so initially only ***. If you use - as I do - the lights a little to get, unfortunately,
quickly on the guaranteed limit before a vulnerability is visible
Let's see what the other lamps do and how the supplier DEL-KO handles the complaint.

(Late) Supplement 06.06.2013
The defective lamp is easily replaced and the Lord by the customer service was very accommodating.
The refund of shipping was likewise, only the accounting had to pretty much time :-(.
I recommend an original box for safety's sake lift because such long containers are rarely available
(Rolls are shipping expensive!).
I go first to a single defect and therefore give it ****