Color temperature comfortable, subjectively only minimally cooler than halogen (nominally 3000K)
Spectrum unfortunately in turquoise blue to cyan is a gap in the spectrum (presumably by the spectral filter used, which can be seen very well with a spectroscope), otherwise good color rendering
Design larger than a G4 Halogenbirnchen, does not fit into the usual built-in spotlights, in (semi-) spherical reflectors no longer sit the light sources in the middle, can also reflected light not the illuminant completely intersect. With built-in spotlights can encounter the ev. By omitting the cover glass, since these must protect no hot halogen lamps more from dirt.
Luminous efficiency in comparison with a 5 Watt LED lamps similar specification with aluminum body and 5 large LED appears the 3 Watt Warm White version of this bulb is almost ebenbürdig thanks to better light distribution and can easily replace a 20 watt halogen bulb.
Light distribution, the many small cast SMDs produce a large-area light source, which lights up evenly in all directions and over a halogen bulb produces a softer, smoother and less directional light.
Power thanks to AC / DC-Suitability easily operable also to halogen transformers, if you will comply with the minimum performance
¡Attention, transformers must match! a consumer with insufficient energy consumption closes the circuit actually short. Here the indication of the minimal appropriate wattage must be observed at the transformer. The sum of the consumer must meet these constantly, ideally, if a consumer fails. Usually this indication by labeling as "Sec: 11.5V = 2060 W". Since LEDs only about 1 / 4-1 / 7 of the power consumption of a halogen light source and often have a minimum performance halogen transformers have only about 1/3 of the maximum power, minimum power loss with LED lamps is often not achieved. A good transformer has a short-circuit protection, low-cost transformers can damage or even cause fires.
¡Aging! To this end, of course I can only speculate, but since the devices are molded into relatively poorly conductive silicone, they are also likely to lower heat output are quickly quite warm because the silicone dissipates heat not so fast. Since semiconductors to age faster, the higher the temperature in continuous operation, you should provide at least for sufficient circulation around the bulbs, so that reaching the outside heat can be dissipated.