Quite a difference in price for what looks to me as well exactly the same lamp. Too bad he won't sell outside of the UK/Ireland.
There IS a difference in brightness or how do you say that? Lumen?
The Daylight one states 42 Watt and an equivalent of 240 Watt, this one is 42 and 210 Watt. I use 2 x60Watt blue daylight bulbs now so I guess even 210 would be a huge difference.
Of course if the cheaper lamps aren't 'flicker-free' you could end up nearly blind and with a gigantic headache after only a few hours.