Essentially the same as a Traffic Light, but only one bulb is shown that can change colour depending upon which target range the measure falls in.
Example
This chart has been added to a dashboard that is controlled by a parent chart. When an element is selected in the parent chart, the colour in the lightbulb chart will update.
In order to understand the data in Lightbulb Chart Types, Data Labels should be added. These are not displayed as default so please refer to Show Data Values for details on how to add these.