Mafsu,
A windshield blocks more than 50% of the UV. Most of that protection actually comes from the glass itself, but a small amount does come from the PVB...
Couple things first...
The Pro Cure light can cure resin.
The sun can cure resin.
Now that we've got those things out of the way, here's the thing. With UV light, it's very easy to test the claims of manufacturers. If you have a UV meter, you can tell exactly what our light puts out, versus the sun, versus the Pro Cure.
Sun VS. Lamp:
Right now, Eugene Oregon (approximately 45th parallel), mostly sunny 65 degrees, 3:00pm. Our standard light puts out 3.5 times the UV energy (in the curable range) that the sun does.
Now, does that mean the sun never puts out more? No, of course not. In the summer here, there will be more UV energy from the sun. Also, if it's bright and sunny, you're in Arizona, knock yourself out. Farther north you go though, the more careful you have to be. The whole point is, just because it's warm and sunny, does NOT mean that you've got much UV energy in the curable range. And unfortunately, it's very hard to determine whether a repair is fully cured inside the glass, because as well all know, pit resin will cure in less than a minute no problem.
I know I know. We're the big bad manufacturer, trying to sell each and every one of you a lamp. Whatever. The sun WILL work, but sometimes better than uv lights, sometimes worse, but more importantly, unless you're in extreme conditions, or have a meter, you won't know.
Pro Cure VS. Other Lamps:
Now, here's where i'll ruffle some feathers...(sorry GlasWeldTech

). This truly isn't meant to bash anyone. It's simply testing that we have done. If people want to buy from Glasweld, go right ahead, but if you want the most UV output in the curable range that Glasweld sells, go with their standard lamp (which is the same one we sell). That light puts out
twice the UV output in the curable range than the Pro Cure! I wanted to say generically the "quick cure lights," but unfortunately so many people have been naming this light. We have tested this light. It's by NO MEANS a bad light. It puts out a sufficient amount of uv light, will cure resin, all that stuff. I'm not saying it doesn't work, i'm not saying anything other than the curable UV output is lower than their standard light, and therefore it will cure slower than their standard light, and it's not a "quick cure" light.
Now, for Glasweld systems and the way they do repairs, it makes sense to have a light that fits over their bridge. So, there may be other reasons for Glasweld users to use that light, but it's not because it's a "quick cure."
Before you Glasweld people jump all over me, numbers are numbers. Let me just say that ANYONE can do the exact same test I did. If you want to purchase a UV light meter and do your own testing, private message me and i'll show you where you can get them.
Delta Kits, Inc.