Assuming you're referring the the lens flare effect, I would personally use a PNG for this.
<div class="progress">
<div class="progress-bar" style="width: 69%;"></div>
</div>
You could use .progress .progress-bar:after
in your CSS to add a background-image
of the glowing/lens flare graphic which, due to it being isolated in an :after
selector, can be animated independantly (flickering, pulsing, you name it).
If you haven't already, check out the Progress Bar component in Bootstrap, as they have a pretty extensive set of styles and variations to get started.
Resources: