"Triplebright" replacement bulbs.

[Andrew May]

A bulb in my triplebright lamp went last night leaving me with just one tube so it's time for a replacement (or two).
Craftlamps.co.uk (who are based 5 mins from my house!) have them listed as £15 each:
http://www.craftlamps.co.uk/product/daylight-energy-saving-replacement-tube-14-watt

But here on amazon I see what appear to be the same ones for less than £4 (and higher lumens):
http://www.amazon.co.uk/F14w-Efficiency-Triphosphor-Fluorescent-549mm/dp/B003UCY556

Am I missing something? I don't mind waiting for the Amazon ones if I'm saving £20!