I also had SkyRay STL-V2 and I'd say it's the cheapest that offers more than it's value. I had my first two years ago and it is working fine until now, you've got to check it.
I'd rather opt for expensive long-life LED bulbs. I may have to spend more but the savings is more as well. Compared to cheap LED bulbs that will not work after few months. Most expensive LED bulbs have warranty for atleast 2 years as well!
I wish I have known this a lot earlier. My 4-year old laptop is constantly plugged and I seldom use the battery unless it's really needed. Now, my battery's life expectancy runs less than an hour.