Automotive LED parking/signal light

I want to use an array of up to 150 LEDs for automotive brake and signal lights. I've searched online for anyone who might sell such a circuit, but no luck. The array of LEDs will be full brightness when brake or signal is applied and dim to 1/3 brightness when in parking light mode.

I thought about building some kind circuit myself if I could find a simple schematic, but everything seems too complicated for me because... I'm not very smart. Does anyone know of a place where I can purchase such a circuit or can anyone here build such a circuit for me for a price? I'll need 6 of them.

I'd like some flexibility because two of the lights will use about 150 LEDs, two will use about 75 LEDs and two will use ten LEDs.

Many thanks!

Parking lights? What're they for? Don't you have street lights?

Over here, we have "daytime running lights" which is only the headlights on but dimmed. The beaurocrats planned it so that only the big trucks (lorries?) and SUVs (Land Rovers?) use high-beam that blind all ordinary smaller car drivers. The smaller cars use low-beam and still can be seen. Great planning.

My city has changed all the traffic lights to LEDs. At night they light the whole intersection and cause complaints from people living nearby. They use about 30 LEDs.
Good luck with your umpteen-dozen LEDs. Why so many?

are you using your car for disco lights? :?
One ultrabright led can be seen from up to 3 miles away if that helps.

Did you search before posting? this may help some