Jim Cramer had some strong opinions about where investors should put their money during CNBC's "Mad Money Lightning Round," and not all of them were sunny.

Energy Play Gets the Thumbs Up

When it comes to Enterprise Products Partners LP (EPD), Cramer didn't mince words. "That's the one you want to be in," he declared. The energy infrastructure company seems to have Wall Street's backing too. Morgan Stanley analyst Robert Kad maintained an Equal-Weight rating on December 2nd while bumping up the price target from $33 to $34. Shares closed Friday down just 0.3% at $32.13.

Too Hot to Handle?

Lumentum Holdings Inc (LITE) got a less enthusiastic response. The stock has "had such a run," Cramer noted, adding "I can't say yes to that." It's the classic problem of a stock that's done well—do you chase it or wait? Rosenblatt analyst Mike Genovese clearly thinks there's more room, maintaining a Buy rating on December 4th and raising the price target from $280 to a hefty $380. Still, shares took a 12.8% hit on Friday, closing at $324.35.

Hold Steady on DuPont

For DuPont de Nemours Inc (DD), Cramer recommended staying put. The chemical giant reported third-quarter results on November 6th that beat expectations, with adjusted earnings per share of $1.09 topping the $1.06 estimate. Revenue climbed 7% to $3.07 billion from $2.86 billion a year earlier, beating the $2.90 billion consensus. The catch? DuPont reduced its full-year outlook despite the strong quarter. Shares dropped 1.4% to close at $40.93 on Friday.

The Musk Factor

Then there's T-Mobile US Inc (TMUS), where things get interesting. Cramer said the wireless carrier is being "hurt by the death star that's Elon Musk, and, I have to tell you, I would be worried too." He's taking a wait-and-see approach: "I have to wait, it has not settled down yet." The reference to Musk presumably points to competition from Starlink and other satellite-based communication ventures. Goldman Sachs analyst Michael Ng maintained a Buy rating on December 12th but lowered the price target from $287 to $251. The stock slipped 0.1% to settle at $195.16 on Friday.