These Aurora 12V 2.2w G4 "cool white" 6400k are a perfect replacement for 20w halogen bulbs (They are very bright!)used in display cabinets. Although some prefer a "warm white", I personally prefer lighting that is close to the colour temperature of daylight, which is often in the 4000K to 7000K range. These LED's are quite large in diameter, but I found that they still fit perfectly into old halogen cabinet light fittings. People often have problems with flickering when used with old 12v transformers; however this is very much dependent on the specification of the transformer. I was lucky, all my transformers (10 years old) are rated from 0w-70w output, which means they are capable of driving lamps of very low wattage without flicker. In fact some transformers will simply switch off their output as they cannot detect any load from low wattage LED's.
The LEDs used on this Aurora branded capsule seem to be of a good quality and the product was contained in a sealed antistatic bag with clear product info on the outside.
Lights4u provide a range of Aurora LED's which are of a higher quality than many others I've tried, plus Lights4u have a free shipping service via Amazon fulfilment(Great!) which is very fast.