Them or these?

[sahanav]

In the sentence below should it be these or them?

The 50 halogen fixtures were radiant enough to look beautiful, but the chances of these saving energy were gloomy.

 

[Route21]

As an NES but not a teacher, I would not say "these". I'd definitely say "them".
Regards
R21

 

[Barb_D]

Or "their"