据NEMA协会数据显示：白炽灯指数在2008第一季度增加了0.7%，结束以2007第二季度开始的一连串下降。尽管有稍适的季度增长，指数在两年基础上还是下降了24.5%。虽然白炽灯的装运从2004年起就开始平稳下降，但从指数看，在2007年仍下降了18.6%。
相反的，CFL（节能灯）的指数与去年同期相比，增长33%。而且，从2004年起，指数增长五个幅度。随着2002年的大批量装运，部分是因为加利福尼亚的能源危机引起的，包括2005年在内，CFL运送指数每年平均为66％。然而，在2006年和2007年增长率分别增长了112.6％，138.6％。这些行业趋势有可能继续，即使是在美国当前减缓的经济发展情况下。然而，随着消费者使用CFL灯取代传统白炽灯的使用率增长，指数会继续增长。
original text
CFL Index Shines as Incandescent Index Wanes
NEMA’s Incandescent Lamp Index increased 0.7 percent for the first quarter of 2008, ending a spate of declines beginning in the second quarter of 2007. Despite the modest quarterly increase, the index fell 24.5 percent on a year-over-year basis. Although shipments of incandescent lamps have declined steadily since 2004, the index showed the largest annual decline to date, dropping 18.6 percent in calendar year 2007.
Conversely, the index for compact fluorescent lamp （CFL） shipments grew by 33 percent compared to the same period last year. Moreover, the index has grown by a magnitude of five since 2004. Following a surge in shipments during 2002, partly brought on by the energy crisis in California, growth in the CFL shipments index averaged 66 percent per year through 2005. However, the growth rate of the index soared in 2006 and 2007 increasing by 112.6 and 138.6 percent, respectively. These industry trends are likely to continue, albeit at a more tepid pace given the current slowdown in the U.S. economy. Nevertheless, the divergence of the indices will continue to grow as consumers increasingly substitute CFLs for traditional A-Line incandescent lamps.