Illuminance card with background

Who it’s for

Building managers, facilities teams, and greenhouse growers ask “is the light level adequate right now?” They use these cards on dedicated building management displays or reception screens where a background image gives the card a polished look.

What it does

A sensor reading 8 lx shows an orange icon and value — Moderate — over the preset background image. The same card turns red at 35 lx — Bright — and dark gray at 0.5 lx — Dark.

• Color-coded icon and value that shift across five illuminance bands from Dark to Very Bright
• Decorative background image bundled with the widget, with a white overlay that keeps the text readable
• Last-updated timestamp showing how long ago the reading arrived
• Shows one sensor’s data; it does not chart trends or compare multiple zones

How to set up

Data keys

Key	Role	Type	Description
illuminance	Main value	Timeseries	Illuminance in lx; change the key name to match your device’s telemetry key

The widget ships with a simulated function datasource key labeled Illuminance, so it draws random values until you point the datasource at a device and rename the key.

To point it at your own device: open the dashboard in edit mode, open the widget’s Datasources, pick the entity or entity alias, and replace the function key with the key your device reports.

The card shows the value in lx with no decimal places. If the key has never reported, the card displays the label and icon with an empty value, not an error.

Value ranges

Range (lx)	Level	Color
< 1	Dark	Dark Gray
1–5	Low	Orange
5–20	Moderate	Orange
20–50	Bright	Red-Orange
50+	Very Bright	Red

How to customize

• To swap the background image — open the widget settings and set Background to a different image or switch to a solid color.
• To adjust how much the background shows through — change the Overlay opacity; lower values reveal more of the image, higher values push it further back.
• To use your own illuminance thresholds — edit Icon color ranges and Value color ranges; set the same boundaries in both so the icon and the number always agree.
• To change the icon — set Icon to any Material or MDI icon name.
• To hide the label, icon, or timestamp — turn off Show label, Show icon, or Show date.
• To match your dashboard’s fonts — set Value font and Label font.

Tips

• Keep Icon color ranges and Value color ranges on the same boundaries so the icon and the number always show the same band.
• If the background image reduces contrast, raise the Overlay opacity to keep the text readable from a distance.