Note: This article has been modified from an earlier version. See clarification below.

This month, a new infomercial will sell directly to parents a product that has, so far, been sold in the U.S. to hospitals and hotels: a light bulb that helps kill germs. David DeMartino was 35 years into his lighting-industry career when he learned about the bulb, which is coated with titanium dioxide. When it's lit, it breaks down mold spores, bacteria, and nitrogen oxides (one component of smog). It also comes in a full-spectrum version, which helps guard against seasonal affective disorder. DeMartino, based in Deerfield Beach, Fla., sells OzoneLite four-packs for $140.

To wean his six-year-old off PlayStation, Philadelphia inventor Bryon Thompson created a device that encases a TV's power cord. Parents can program it to lock out the child after a certain period of time. Thompson's Time's Up lock, which can deaden a game console as well as a TV, is $25 and available this month on QVC and at Wal-Mart and Target.

Finally, Jason L. Sullivan, the CEO of St. Petersburg, Fla.-based Guardian Lion, is manufacturing wearable panic buttons. The thumbprint-size gadgets come in necklace and wristband versions; when children press the button, it silently emits GPS signals, allowing authorities to track them within 15 feet.

Clarification: An earlier version of this story misspelled the name of David DeMartino's company. The correct spelling is OzoneLite.