I followed the skaeser link and read, "Color Temperature 3200K"

That's your problem with those softboxes.  WOW!

Earlier in the thread, I wrote,

Your bulbs might be Tungsten at 3400 Kelvin
... but you might want Daylight or Flash at 5500 to 5600 Kelvin. 

You should contact them and have them GIVE you bulbs that are balanced for DAYLIGHT. ...

At the very least, they should explain why they are selling those softboxes with those bulbs ... what application do they expect you to be using? 

BTW, you would almost be better off with a Northern Industrial 500 Watt Portable Halogen Worklight or 2 for only $6.29 each plus shipping.  Please be aware that I have no idea what color temperature you would get with those $6.29 units.  OTOH, you might be able to get replacement bulbs with a known Color Temperature. 

Actually, I 'cheated' and searched Adorama for 'halogen 500 watt' ... the ones they sell are 3200K.  Therefore, all halogen bulbs will probably be 3200K. 

Since 5500K to 5600k is the color temperature for flash, I searched Adorama for '5600K' and found this nice toy fo under $40 ...
Bescor LED-14, Sub-Miniature 14 watt 5600k Light, Runs 40-45 Minutes with 2 NiMH "AAA" Rechargeable Batteries, with 4-Hour Charger.

You see, you don't have to settle for yellow lights when you want to match the color of your flash. 

--Martin