Ya think this HPS would be OK?

I'll have a flower chamber that is 2'x2'x5'. I can't afford an expensive grow package and found this one.

E-HR4H40QZ
HID NEMA Floodlight with quad-tap CWA ballast. Includes 400-watt HPS ED18 lamp.

Applications - Building facades and displays. Also effective as security lighting, for storage areas and commercial sites. Not for use as uplight.
Lamp Output: 48000 lumens
Lamp Color Rendition: 22 CRI
Everyday Low Price
$115.90 Quantity: Features:

• <LI type=disc>Fixture comes without mounting. (Order E-ACS slip fitter or E-ACU U-bracket) <LI type=disc>NEMA Floodlight <LI type=disc>Quad-tap CWA ballast (HPF) <LI type=disc>Sturdy die-cast aluminum housing and frame, with dark-bronze polyester powder-coat finish. <LI type=disc>Tempered-glass lens, thermal-shock and impact resistant <LI type=disc>Hydroformed, anodized aluminum reflector <LI type=disc>Typical Spacing: 2 to 4 times the mounting height. <LI type=disc>UL Listed for wet location <LI type=disc>1-year warranty
  [*]NOT FOR USE AS AN UPLIGHT

16-1/2-in H x 16-1/2-in W x 7-in D
Typical mounting height: 15 to 30 feet

More Specifications Instruction Manual Download Transferir el manuel de instrucción Extra Lamp - 400W HPS Lamp Accessories

you can go on ebay and find deals on 400w grow lights for around that price..

For that same money you could get this instead:
http://www.htgsupply.com/viewproduct.asp?productID=47929

Or yes, shop ebay and craigslist in your area and check out the deals...

That light in that space should have a cooltube though to keep the heat anywhere near controllable.

That means something like this, or a DIY version of this:
http://cgi.ebay.com/400w-HPS-COOL-TUBE-GROW-LIGHT-400-watt-Sodium-Cooltube_W0QQitemZ180127387721QQcmdZViewItemQQptZHydroponics_Seed_Starting?_trksid=p3286.m20.l1116

That space could be handled by a 250w also, if you can't afford a cooltubed light or don't want to make one, but you'd still need a remote ballasted light and great ventilation.
.

Inside Sun.
cono 400w HPS with White Reflector


This system includes: Refurbished ballast housing
New 400 HPS ballast and bulb
18' White Batwing Reflector
Electrical cable - Wall to Ballast 3.5 feet (standard 3 prong plug)
Electrical cable - Ballast to Light 10 feet
3 year warranty (except on bulb) Usually Ships in three to five days
Econo 400w HPS with White Reflector List Price: $130.00
Your Price: $120.00
You Save: $10.00

Bulb Upgrade

get something with a detatchable ballast. also, a 250watt would be fine and a little less heat for a 2x2. if you go any larger though go with the 400watter