ENTLER light fixtures ship with a 4w dimmable LED Bulb. Options are available for brightness, color temperature, and dimming. These are Edison screw-type bulbs and no external drivers required. Here are some links!
Liii & Artman 4w Tala 4w Bulbrite 4w GE 4w Feit Electric 5w Leools 6w
After shipping and installation, occasionally the bulb will need to be tightened to refresh the electrical contacts. Please give this a try before other troubleshooting steps.