Why to cry right away. I am always willing to help everybody here.How and at what current did you measure the wavelength? I'm measuring 509nm at 108mA with no lens. :cryyy:
As posted in this thread I did all the measurements at the recommended current regarding the data sheet, which I also attached in this thread. The parameters were:
I = 80mA and temperature stabilized to ~ 25°C.
You seem not to have a propper heatsink if you measuring the wl without a lens (might be wrong though). Are you using a calibrated spectrometer?