But how our body responds to light is also affecting how these clocks align with the 24-hour day. There's not just early birds and night owls. There's a full spectrum that goes to pretty great ...

When the lights dropped, both drivers launched clean and fast—visually, at least. The Challenger surged ahead, roaring down the strip to a blistering 10.33-second pass at 135 mph .

This kit comes with 12 lights, and with a 62% savings, each light costs only $2. The lights have over 300 perfect reviews and a 4-star rating at Wayfair. "Very good quality," one shopper wrote.