Lum (UbiArt games)
Lums are beings of pure energy who frequently appear in the Rayman series.
Lums (pronounced “Looms,” like ilLUMination, and not Lums, for dumb) are beings of pure energy possessed of a mindbogglingly sunny disposition. They are an important source of magical energy in the Glade of Dreams, making Lums Racing a popular Gladewide sport. The competition pits up to four players against each other in crazy crosscountry competitions to collect Lums. Anything goes in this wild race, or as we say around here, no smack is too packed. While all players go home winners, only one takes the prize: the player who nabs the most naphappy Lums, of course! No holds barred!—Official site, Rayman Origins
Lums can be quite illuminating, for those who know how to use their energy...
The Lums in Rayman Origins do not fit into the system of colours used for the Lums in the other games. Each Lum in Origins can alternate between yellow and red, but they do not have the same effects or appearances as Yellow Lums or Red Lums. The number of Lums in Origins is never defined, but seems practically unlimited, much like the Tings in the original Rayman; however, Rayman 2: The Great Escape makes it clear that there are only 1,000 Yellow Lums in existence, and they are currently contained in the Heart of the World at the time of Origins. The Lums that appear in Rayman Origins are clearly sentient creatures, and have arms, legs, wings, eyes and mouths; in the other games, most Lums are simply orbs of energy with wings.
In Rayman Origins, the player often comes across large, crowned Lums called Lum Kings. Collecting a Lum King causes all the Lums in the area to sing and dance for a few seconds, while their colour changes from its usual yellow to red. While in this state, each Lum is worth two. Lums can be found floating freely or hidden inside nenuphars and Bulb-o-Lums. They can also be gained by bubblizing and defeating enemies. At the end of each level, the heroes give their Lums to the Magician, who grants them Electoons in exchange. At the end of the game, it is revealed that the Magician has been using these Lums to power the mechanical army he built in the Moody Clouds to take over the Glade of Dreams and rid it of the Bubble Dreamer.