Halogen Torchier Lamp For Plants?

I was talking to a person on the net and they told me that they use a
halogen torchier lamp with adjustable brightness to light their tank.  They
dismantled the lamp they bought, and then hung like a pendant light.  I
thought it may be a very good idea.  Is it?  Is halogen a effective light
for plants?  It would be very bright!  A possible cheap substitute for metal