Thoughts on this reflector?

Right now I have 2 parabolic reflectors (12" each) for my two metal halide units of my 4' tank. I have 2 t-5s and thinking about adding 2 more. Neither of the t-5s have full reflectors, but just utilize 12" of the reflector.

One thought was to add two more 12" reflectors (I linked them too, let me know if they are good quality) to get 48" of length or to add one of the 48" reflectors below.

Also mind you. my current reflectors are fairly tarnished. They seem drab and the polish seem squite poor. I am sure it is effecting my PAR.

Is 2" down the sides of the unit below enough?

http://www.hellolights.com/46-5-Poli...&searchSize=12


http://premiumaquatics.com/products/...reflector.html

 

This is what I'm dealing with now:

 

Here it is now:

 

What about these (Yes, I know they're discontinued).

http://www.marinedepot.com/PFO_24_i...ectors-PFO_Lighting-PF2635-FILTACRAMH-vi.html