These lights are made with Nichia high CRI (92) LEDs. They produce a pleasing warm incandescent color of light (2700K) and the lights have a rated useful life of 50,000 hours.
Each puck light comes with a lead which contains a constant current driver. Just feed the light 24 vols DC and the driver does the rest.
These lights are perfect for retail display where color accuracy is paramount and in hospitality where a warm color light is required.
Manufactured by Solis Lighting in the US in an ISO 9000 certified factory and are RoHS compliant.
Datasheet is here.
Note that these are supplied without a power supply as Solis only supply US rated 120 volt power supplies for these, but any 24 volt regulated DC power supply of adequate current capacity will work, such as this one.
Also please note that these are sold for experimentation only as they may produce electrical interference on some TV/radio channels (this should be easily fixed by fitting a suppression bead either side of the driver).