Depends how fast you get your florescents... if it's 1-3 days, it's ok, if it's more than 4 days, don't.
850x4=3400 lumens is not very very much, seeing that HID bulbs go into the 10000 lum mark. Get some better bulbs. There's some energy saving bulbs (Phillips) that have 1500 lum. They're worth a shot.