Photoconvertable Fluorescence

Photoconversion works by having a fluorescent protein which is excited in the normal way, but when exposed to UV light its properties change and it can now be excited and emits at different wavelengths. Ideally, the longer-wavelength state is brighter. This allows the one protein to convert from green to red for example. However, photoconvertible fluorescence is irreversible, unlike photoswitchable fluorescence.

Photoconversion