In December, I introduced you to the now not-so-new T-piece for the Philips Hue Perifo track system. Among other things, I discovered that the asymmetrical shines of the Perifo system run in different directions from the T-piece. This means that you cannot place long light sources such as the Hue Perifo Gradient Light Tube or the Hue Perifo Linear Lightbar over the T-piece on the track system as they do not snap into place properly.
Philips Hue Perifo: Attaching light sources across a T-piece Practical tip for Lightbar and Light Tube
Practical tip for Lightbar and Light Tube