"Transformers: Dark of the Moon" opened with a strong -- but not stellar -- $13.5 million from screenings Monday night.

Approximately $5.5 million of that total was garnered from 9 p.m. showings on roughly 2,700 3D screens. The other $8 million came from midnight screenings (3D and 2D) at some 3,000 theaters.

2009's "Transformers: Revenge of the Fallen" grossed $16.6 million just from midnight screenings on a Tuesday night.

The drop is actually bigger than it looks, as "Dark of the Moon" has the advantage of premium 3-D ticket prices.

Paramount expects the film to draw a robust $155 million by Independence Day.

The first "Transformers" film debuted to $8.8 million from evening and midnight showings.

"Dark of the Moon," directed by Michael Bay, stars Shia LaBeouf, Rosie Huntington-Whitely, Tyrese Gibson, Frances McDormand and John Malkovich.

Read Drew McWeeny's review here.