I use the two lamp heads in Verbidnung with 85 Watt Photo Spiral lights and soft boxes. Installation works without problems. The socket sits stably. Cable is long enough so that you can work with it well. Unfortunately scho no longer worked after a short time the on-off switch of all two lamp heads. Good that they have given up the ghost on the On switch, so I now always have to pull the plug. Contacting the seller was unfortunately unsuccessful and gave up.
In itself really useful and works well, just up on the on-off switch. Because they remain manageable, at least 3 stars, also because of the low price.