you should do well with the helmet..it has good specs listed.....the range is selectable hi and low...you may need to select to low if grinding but with welding you should be on hi range...your number depends on again, current and material...attached is the OSHA tact sheet and types of welding and current chart for recommended minimum eye protection...of course if you can go darker and still see do so...if you cannot see at the minimum...you need to find an added method of lighting your work area to assist your visual requirements...
https://www.osha.gov/Publications/OSHAfactsheet-eyeprotection-during-welding.pdf