There are complicated handling instructions for the mRNA vaccines. The sunlight remark is in reference to the J&J claim their vaccine survives temperature excursions even after mixing. So I don't specifically mean the sunlight, but more the sensitivity to temperature changes.
One question: "Viral vector vaccines do not need special cooling, and you can also shake them at will, or even do vaccinations in full sunlight."
Does that imply the others can't be shaken or exposed to bright light? I knew they needed to be kept very cold, but nothing beyond that.