Please find the "LED bulb cooling" application ID:78141 application gallery example solved in COMSOL 5.4 version in the shared folder below. The model was solved using two different solver configurations. The original applicaion gallery was only for COMSOL 5.5 and COMSOL support kindly refused to provide a 5.4 version of the model when I request a compatible model for 5.4. I also found some discrepencies and errors in the documentation provided in the "models.heat.led_bulb.pdf" in the flow regime parameter caluclations.
The solved models are uploaded here with the "led_blb.mpbin" COMSOL provides under their application gallery.
https://drive.google.com/open?id=1lUlzvxwk7qLc47lCsvBd0i7arIuDOcbw