since u didn't provide more information about the lamps, all I can say is just wait and see. will thy strech, or won't they.
event if they won't, u will need more lights in couple of weeks. if u not going to use that kinda lights just for veg. stage (not for lighting your desk), drop it. expencive, low in wattage and lumens.
get CFL's. proven stuff. cheap too...
peace