A: Yes it is fine and safe to look at. I enjoy having mine on all the time.
A: Thank you for your question, it is not recommended to look directly at the light.
A: Thank you for your question, please check your air purifier's manual for recommended bulb type and specs.
A: Ultraviolet LED, which used for indoor hydroponic growth level for plant cells.
A: The one I bought turned out to be a Philips 75ablb. The wavelength(s) were unspecified and I do not have the equipment to measure. The package does specify "indoor" and I can verify that it doesn't work very well in the cold. Further, it doesn't excite organic molecules to fluoresce the way one would expect of a UV source to do.
A: Thank you for the question. Bulb measures around 404 wavelength
A: Thank you for the question. This item does not emit any UV light.