After seeing this thread yesterday and the cheap LED's, I looked around on other forums and it seems that may be a problem. Like I mentioned previously, it's a wattage issue.
The great things about LED's is the quick curing times. I get 10secs for Foundation gel, 20secs for light colors, 30 for my darks. Top coat comes in at 30secs too. I've read that some ladies had to cure the darker colors like Bella's Vampire for almost 2 minutes!! That would make it roughly the same time as a UV lamp.
Ultimately, I don't suppose it matters how long it takes, as long as that is not the reason why you bought an LED in the first place.
Another thing to keep in mind for those buying LED's, is that it will not cure some brands, ie Shellac, LeChat, Gelac, EZFlow Gelez, NSI, and a few others but I don't remember them now, but if you're just sticking with the brand that comes with the light, you should be fine.
And yes, I'm also interested in how the cheaper ones work as I'd like to buy one for travel........
I'm still hot!! Only now, it comes in flashes.