That poor plant is screaming for light.

It may be female, but with the lack of light it could go either way or never flower?????????????

65w? Typo?

A 400 w is going to have trouble giving enough light to a plant this tall. Also, I find that aluminized or reflective foils cause this stretching. Use white, it reflects the light more evenly, white reflects all light.

Is the light too far from the plant?