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There are several types of multi-color white LEDs: di-, tri-, and tetrachromatic white LEDs. Several key factors that play among these different methods, include color stability, color rendering capability, and luminous efficacy. Often, higher efficiency will mean lower color rendering, presenting a trade-off between the luminous efficacy and color rendering. For example, the dichromatic white LEDs have the best luminous efficacy (120 lm/W), but the lowest color rendering capability. However, although tetrachromatic white LEDs have excellent color rendering capability, they often have poor luminous efficacy. Trichromatic white LEDs are in between, having both good luminous efficacy (>70 lm/W) and fair color rendering capability.
What is a factor that may be different in the various types of multi-color white LEDs?
A: luminous efficacy

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In addition to films, Turner Classic Movies also airs original content, mostly documentaries about classic movie personalities, the world of filmmaking and particularly notable films. An occasional month-long series, Race and Hollywood, showcases films by and about people of non-white races, featuring discussions of how these pictures influenced white people's image of said races, as well as how people of those races viewed themselves. Previous installments have included "Asian Images on Film" in 2008, "Native American Images on Film" in 2010, "Black Images on Film" in 2006 "Latino Images on Film" in 2009 and "Arab Images on Film" in 2011. The network aired the film series Screened Out (which explored the history and depiction of homosexuality in film) in 2007 and Religion on Film (focusing on the role of religion in cinematic works) in 2005. In 2011, TCM debuted a new series entitled AFI's Master Class: The Art of Collaboration.
In what year did Arab Images off Film first appear?
A: unanswerable

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The BYU Ballroom Dance Company is known as one of the best formation ballroom dance teams in the world, having won the U.S. National Formation Dance Championship every year since 1982. BYU's Ballroom dance team has won first place in Latin or Standard (or both) many times when they have competed at the Blackpool Dance Festival, and they were the first U.S. team to win the formation championships at the famed British Championships in Blackpool, England in 1972 . The NDCA National DanceSport championships have been held at BYU for several years, and BYU holds dozens of ballroom dance classes each semester and is consequently the largest collegiate ballroom dance program in the world. In addition, BYU has a number of other notable dance teams and programs. These teams include the Theatre Ballet, Contemporary Dance Theatre, Living Legends, and International Folk Dance Ensemble. The Living Legends perform Latin, Native American, and Polynesian dancing. BYU boasts one of the largest dance departments in the nation. Many students from all different majors across campus participate in various dance classes each semester.
Where has the NCDA National DanceSport championships been held?
A: unanswerable

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With the building of Christian basilicas in the late 4th century, wall and ceiling mosaics were adopted for Christian uses. The earliest examples of Christian basilicas have not survived, but the mosaics of Santa Constanza and Santa Pudenziana, both from the 4th century, still exist. The winemaking putti in the ambulatory of Santa Constanza still follow the classical tradition in that they represent the feast of Bacchus, which symbolizes transformation or change, and are thus appropriate for a mausoleum, the original function of this building. In another great Constantinian basilica, the Church of the Nativity in Bethlehem the original mosaic floor with typical Roman geometric motifs is partially preserved. The so-called Tomb of the Julii, near the crypt beneath St Peter's Basilica, is a 4th-century vaulted tomb with wall and ceiling mosaics that are given Christian interpretations. The Rotunda of Galerius in Thessaloniki, converted into a Christian church during the course of the 4th century, was embellished with very high artistic quality mosaics. Only fragments survive of the original decoration, especially a band depicting saints with hands raised in prayer, in front of complex architectural fantasies.
In which basilica is the Tomb of Julii?
A:
St Peter's Basilica