I personally tested each head and they work great. JTL is a US based company that has been around for decades. The products are of a high quality and built to last. WARNING : These are very powerful and can get very hot. Do not use with metal attachments like barn doors or a snoot as they will be over 200° nearly instantly.
Use the correct type of vented soft box or Umbrella to prevent overheating. The item "Lot of 3 JTL 500W Everlight Studio Lights +8 Bulbs Photography Photo Video 2817" is in sale since Friday, April 23, 2021.
This item is in the category "Cameras & Photo\Lighting & Studio\Continuous Lighting\Lighting Units". The seller is "speedster120" and is located in La Jolla, California. This item can be shipped to United States.