2x150, 175 or 250W MH? (+) Double ended or Single -120G, 48x24x25

they have awesome deals on that website but they dont list the spectrum for bulbs
for example


High Intensity Discharge Lamp, Metal Halide Lamp, Watts 250, Lamp Designation CMH250/U/830/R, ANSI Number S50, Lamp Shape T15, Base Mogul, Color Temp 3000, CRI 85, Initial Lumens 25,000, Mean Lumens 20,000, Rated Average Life Hours 16,000, Light Center Length 5 3/4 In, Max Overall Length 9 3/4 In, Clear, For Use With Enclosed Fixtures
Grainger Item #5TB70 Price (ea.)$139.30 BrandGENERAL ELECTRIC Mfr. Model #CMH250/U/830/R Ship Qty. 1 Sell Qty. (Will-Call) 1 Ship Weight (lbs.)0.3 Usually Ships** Today Catalog Page No.552

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ItemHigh Intensity Discharge (HID) Lamp Lamp TypeMetal Halide Watts250 Lamp ShapeT15 ANSI NumberS50/M168 Lamp DesignationCMH250/U/830/R Mounting PositionUniversal Description/Special FeaturesClear, HPS Retrofit For Use WithEnclosed Fixtures Average Life (Hours)16K Max. Overall Length (In.)9 3/4 Initial Lumens25,000 Color Temp.3000 CRI85 Case Quantity12 BaseMogul Mean Lumens20,000 Light Center Length (In.)5 3/4 Footnotes44,45

 

Is the flat reflector better?

I can't find a reflector by itself without the bulb...guess i can shop around some more.

reefgeek.com has nice retrofit packages but the bulbs are preselected.