Re: Traffic sign with LED
Usually clusters of LEDs are driven in series strings of 6 or less but sometimes many more. In your case you might have 2 strings of 6 and 1 of 7 or 1 string of 4 and 3 of 5. If you're making the clusters, you can wire to stay within your voltage budget. If you're buying prewired clusters, then you must supply whatever voltage their design requires. I especially like the Supertex CL series of linear constant current drivers for projects like this (bottom of page) **broken link removed**. What supply voltage are you using?