Women's Blood Siphoned Out to Feed Invading Aliens [closed]

I think the answer is L'umanoide. I also was looking for this movie for a long time and identified it by pure chance, I came upon this article in io9.com:

It also has some of the best Darth Vader dialog ever, a robot dog named Robodog, a psychic Jedi-child, and an evil queen who has to absorb the juices of one topless young fashion model every day to stay young

Could it be 1985's Evils of the Night? From Wikipedia:

Evils of the Night is a 1985 low-budget science fiction/"porno horror" film starring Aldo Ray, Neville Brand, Tina Louise, John Carradine, and Julie Newmar.

Vampire aliens Dr. Kozmar (Carradine), Dr. Zarma (Newmar) and Cora (Louise) recruit two dim-witted mechanics (Ray and Brand) to abduct teenagers living in a college town and bring them to a rural hospital. There, the aliens drain them of their blood, which they need to stay young.

There is a scene similar (ish) to this in Dark Angel?

The alien kills a girl with a massive drug overdose and then drains a fluid from her to use as a drug.

It has Dolph Lundgrun in it.

Bit of a long-shot, but could it be Life Force.

I say this as it is just within your timescale and involves alien vampires, which links to the symphonic of blood. I saw this years ago, so do not know if the scene you describe is in the film or not. The title just came to my mind while reading your description.