"Mercury content and disposal have long been concerns with CFLs. However, ConsumerReports.org finds that most brands now contain well under the required 5 milligrams or less of mercury per bulb, so this is less of a concern. Some manufacturers use low mercury content and environmentally friendly packaging as selling points. Still, care should be taken if a CFL breaks in order to avoid unnecessary exposure to even minute amounts of mercury. "

"Litetronics also makes low-mercury compact fluorescent light bulbs that limit mercury content to 1 milligram and use lead-free glass and solder. "

http://www.consumersearch.com/light-bulbs/compact-fluorescent-light-bulbs