Understanding picture-elements update

Hi all,

I am trying to better understand how the picture elements card updates.

Having setup a 3D home map that works well, updating instantly with the lights on/off.

When I come to add temperatures/humidity via state-labels, they don’t seem to update on their own (but do if I change the state of lighting).

Similarly I have the daytime map brightness also effected by daytime cloud-cover and sun elevation. Neither of these update on their own either.

Why does a state change on the lighting (Philips Hue, via CC2531 and ZHA) prompt an update of the picture elements card, yet the other state changes associated don’t?

I have created a templated “fake light” that toggles every 5 minutes then used it to overlay a transparent.png file - this had no impact.

TL;DR: What is the best way of ensuring that the picture-elements card updates (like with lighting state change) at least every 5 minutes? A reload on the page is too visually disruptive.

Many thanks.

All best,
Chris.