Choosing a MH Conversion Bulb.

Looking to pick up a nice MH Conversion bulb, just not sure which one to choose. Prices certainly vary, and im willing to pay extra for higher quality, if it's worth it. These are some i've seen on htg.

http://www.htgsupply.com/products.asp?categoryID=4&subcategoryID=83&typeID=44
$60

http://www.htgsupply.com/viewproduct.asp?productID=52401
$50

http://www.htgsupply.com/viewproduct.asp?productID=52141
$35 (and it produces 2,000 more lumens than the others?)

I'm quite confused on which to choose, any input is appreciated.

I use this one. NH360/htl/en ultra ace.

I'm looking for HPS to MH. As far as i can tell, that is the other way around.

I know the first bulb you have listed is hps to mh. Stick to the big brand names like Phillips or GE. They have a track record of performance. Not to bash htg as they are an excellent resource...but most of their gear is inferior Chinese knock offs. There are two really good lighting shops online that come highly recommended. Check out lightingsupply.com and advancedtechlighting.com, both have quality gear and still remain ultra competitive.

Thanks. HTG is my supply for some basic supplies, and i ordered a 400W HPS from them awhile ago, it's been working really well. Thank you!

Sorry read it wrong.