I think your bst bet is to use multiple LEDs and not push them so hard.
I do see where you were misunderstood, you want to flash at one Hertz.
If you want 50 % on and 50 % off, that does not men you can go to double th e current. Your illustration proves that. What is wrong with tewo LEDs ? Mu ch easier for the bang for the buck. Putting them in series should work ju st fine.
One thing though, put Zeners or something across them if you want reliablit y. If one opens up, the other will still ligh but at a lower level and ale rt you to the fact that you need to replace one.
Of course the option of just using one means if it goes out you got nothing . But putting them in parallel is even worse when it comes to drive.
You oculd use resistors across them. They go what like two volts ? So at fo ur volts choose it so it is not a significant load, but is enough to light the other LED in case of failure. Just enough. Then you take your bagfull o f generics and stick one in.
When you push LEDs hard they do not last forever. And I thinkk that is wha t you were asking. "If I only pulse this LED, how much harder can I pump it ?". Well maybe not...
I would go with the lower power thart it can handle continuous and blink it OFF. If you really want huans to see it and now it is not a natural phenom enon or whatever, blink it off three times every other second, and two or f our times on the opposite seconds. Very unikely to occur in nature. Therefo re unnatural enough to catch the attention.
So what is htis all about ? pople kep hitting your mailbox out front ? I go t a guy fixs that. He builds to a brick mailbox type of thing. A regualr ma ilbox can be put on it or custom. but they would brign a bunch of construti on debris and fill the walls, ;up to where the mailbox goes. They put light s on some of them, but the drunks owuld still hit them.
But NOW with that brick and mortar at least the f***ed up their cars ! mwah ahaha.
Anyway, just curious as to the application here. AND, are you trying to get this thing seen during the day ? If so, well it gets pretty bright out the re so you are fighting alot. In the US, here anyway, there are traffic ligh ts that are damn hard to see, and what latitude is Ohio ?
Over in design there is a guy named Jim Thompson who ight know more about t his. He designed a bunch of boards that display on those signs I guess outs ide stadiums and shit, and maybe when there is road work. I'm sure you've s een them if in the US, or probably a bunch of other countries.
Also, in the US, buses and trucks are now (not all) equippd with LED brae l ights with "enuncitaors". Every time the driver hits the brake pedal, when the array of LEDs goed on, it purposely flickers, I think twice. that is de signed to attract attention. Nothing in nature goes on and off like :
I think the DOT requires that on new big trucks and shit. Not sure, but if they don't, the only reason to put them in is a break from the insurance co mpanies and when they speak, people listen.
So maybe :
Something like that.
In other words, you can only get so much attention out of brighness. soetim es it is the timing.