One CFL contains a hundred times less mercury than is found in a single dental amalgam filling or old-style glass thermometer, according to the U.S. Environmental Protection Agency (EPA).
Fluorescent Lights' Mercury Poses Dim Threat

Smash a couple of 4 ft. fluorescent lights in a dumpster and you'll see a white haze in the air. NOT safe to inhale. The little bit in a CFL isn't nothing to worry about.

IF they were that dangerous it would be mandated that these style lamps be recycled as to not contaminate the landfills.

Have a good grow!:jointsmile: