It's lights out for America's most popular light source. The government's final phase out of incandescent light bulbs was Jan. 1. The goal is to save energy; but Consumer Expert Amy Davis explains why everyone is not ready to pull the plug.

As of Wednesday, the old 60- and 40-watt bulbs can no longer be manufactured in the United States. What you see now on store shelves is the last of the inventory some consumers are not ready to let go of.

Local 2 found Cathy Stewart outside of a southwest Houston Lowe's with two arms full of incandescent bulbs.

"I'm still comfortable with these light bulbs more than I am with the CFL's," Stewart told Davis. "So when I went in to do some things, I decided to stock up."

She may not be the only one. Local 2 found a lot of empty shelves at a southwest Houston Home Depot where incandescent blubs used to be. The stock was also low at a nearby Lowe's.

At Home Depot, it's Larry Even's job to teach customers the benefits of LED, halogen & CFL bulbs since soon they'll have no other choice.

"They want to know why the government is taking them off the market," said Even. "And we say, 'Well, to save energy.'"

Even says the initial cost of energy efficient bulbs is higher, but you'll actually save money in the long run. Customers like Stewart say it's not all about the money.

"Some of the lights I have in my house won't take the CFL's," she explained.

The 60- and 40-watt bulbs are the most popular. The 100-watt and 75-watt bulbs have already been phased out. It's all part of the "Energy Independence and Security Act" signed into law by President Bush in 2007.