I went to my local welding store to get a auto darkening lens...they wanted $240.00 for one for my hood. Saw one (complete hood) at Harbor Freight for $35.00 on special. Used it today for the first time, making a custom front mount...works great and you can dial a number of options. Darkening from 1 to 13, and how fast it will lighten, slow or fast. Great for the money.