Triple damage required to 112.500 lb, set HQ downtime to 30 minutes fixed - no modifier, no resupply. 
Sorry Lusche I did not respond earlier to your suggestion.
I do agree that would improve the "lights out" discussion, and it is a very simple remedy. But to most of us, 30 minutes without an opportunity to resupply is about 25 minutes too long (actually, I agree with Caldera it is 30 mins too long).
Now, what I had hoped for was something different, the best of both worlds. Bombers would still be encouraged to attack the HQ and have a worthy result of their efforts. Most everyone can agree there is a balance problem between effort to take down HQ and the damage to quality play time for the affected country.
Lusche your solution just simply adjusts the bar (no pun intended). What it doesn't address is a blank map showing no activity other than a base flashing here or there. Thank you for your thoughtful response Lusche and bear with me, I like what you proposed but want the challenge to game play to be in the air or behind the dash or gun of some type, not in the ability of part time cartoon pilots to divulge strategic information via keyboard or range vox (note: breaking my own rule here).
Is there a viable alternative that does NOT involve loss of radar for a country when HQ goes down?