Health flash staying longer on low Health remaining

How can I get the Health flash Damage Monitor (red color) staying longer on low Health remaining?
I may want a quick flash on the damage impact, but I'd like to have it staying longer when the player's health is very low....
 
The flash only appears when taking damage so this will require you to extend the script to account for the health is low. I will also add it to my feature request list.
 
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