He co-invented blue light acne vulgaris phototherapy,[1][2] [3] as well as a radio frequency device for home treatment for wrinkle reduction.

[13] Starting in 1998 Harth co-founded Curelight, an Israeli company, and developed Clearlight, an acne phototherapy therapy system.

Harth was also a pioneer in the development of other novel devices for dermatological treatment, among them the patented invention in the field of targeted multi–wavelength phototherapy for psoriasis and Vitiligo.

[1][2] In 2007 Harth co-founded Endymed Medical and Israeli company specializing in multisource radiofrequency devices for the professional and home use markets.

Endymed medical was the Europe fastest growing biomedical company in the Deloitte Touche Fast 500 list for 2013[18][19] and is traded on the Tel Aviv Stock Exchange (ENDY:TASE).