Halogen filament bulbs reach full brightness instantly. HID's take several seconds to warm up and reach full brightness from a cold start so will be nothing like as bright when flashed for 1-2 seconds for instance.
I understand what you are saying, but what I'm saying is mine DON'T take any time at all, they are instant when flashed, when first switched on they are instantly bright but dim straight away then there is a slight delay in reaching full brightness, but when flashed there is NO delay! If I use the flash lever before the headlights are switched on (ie; from cold) there is full brightness but if the lever is then held on they dim then build up to full brightness again, same as when they have been switched on. When I get in the truck in my garage and switch the lights on before backing out I can see the beam on the wall in front of me and can clearly see how bright they are.
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