
These lights have 5 cables. Red, black, yellow, white and gray. Red is positive, black is negative/ground, yellow is for pattern change. Gray + White is for syncing (which most standalone lights don't usually have. So they connect the gray on one light to the white on the other to sync their flash patterns. Make sure you connect them before powering up You can continue chain for every 4 bulbs (or more if compatible. Just keep painting the wires grey+white+grey+white. This also includes rubber pads, screws and nuts/bolts for fixing. Very good suggestion for 4 bulbs Curious to see how it holds up to the weather over time.
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