>>4302492The sun is pumping more energy per square mm into your face than any weld flash.
Even NASA suggests number 14+.
>For safe direct viewing of the Sun, #14 welder's glass can be used, or a proprietary material known as>Solar Skreen (Roger W. Tuthill, Inc., 11 Tanglewood Lane, Mountainside, NJ 07092). Although some>telescopes are equipped with Sun filters, many of these are not reliable, and should not be used unless>you are absolutely sure of what you are doing. The only reliable filters are some (but not all) which fit>over the front of the telescope, and reflect awayhttps://www.nasa.gov/wp-content/uploads/2018/08/total_solar_eclipse_21_august_2017_safety_english.pdf 