Hello Federica Prosperi ,

You might want to check this fluorescent dye for in vivo imaging:

https://luminicell.com/products/cellaris-670-cell-labelling-kit-red

Cellaris 1010 is non-toxic and biocompatible, providing long-term fluorescence for up to 10 cell generations in vitro and more than 21 days in vivo, with the longest reported duration extending up to 8 weeks!

Hope this helps with your research 😊

Those two units are for two different types of imaging:

For bioluminescence quantification, use radiance. Radiance = photos/second

For fluorescence quantification, use radiant efficiency. Radiant Efficiency = (photons/second) / (microWatts/cm^2). This unit corrects for the uneven distribution of power from the excitation light source across the field of view.

If you have additional questions, you can reach out to the team of application scientists at Revvity: [email protected]