LIGHT 07 is the 6th in a series of workshops on Photosensor Developments for High Energy and Astrophysics, previously held at DESY-Zeuthen (May 1998), Karlsruhe (March 1999), Paris (September 2000), San Francisco (October 2002) and Kibbutz Eilot (January 2006). All the previous workshops can be characterized as having been intimate encounters of a small number (30-40) of selected specialists in the field, discussing the very frontier developments on photon sensors and the future trends. Selected industrial partners also were part of these workshops.

The main focus of the current workshop shall be the novel silicon-based matrixes of geiger avalanche diodes, better known under the names of SiPM, AMPD, GMPD, MPPC, etc. Though these new sensors have been available for a few years, they are at present making fast and extraordinary progress. In many low light level (LLL) applications the so-called SiPMs could replace the classical PMTs. Currently, there is a big interest for using the geiger avalanche diode matrixes in medical instrumentation, e.g. in PET. One can list numerous other possible applications in industry and also in research, as, for example, in astroparticle physics experiments. Also, new developments on classical photo multiplier tubes (PMT) and hybrid photo diodes (HPD) will be extensively discussed. The recent super-bialkali and ultra-bialkali PMTs show enhanced quantum efficiency (QE) values in the range of 35-45 %, thus coming close to the 45-55 % QE of HPDs with GaAsP photo cathodes. We shall also learn the latest trends in imaging light sensors.

This year's workshop can accommodate a maximum of 60 invited participants.