Hi, I've recently been searching for new light also uk

same dilemma lately, had an alright budget to get decent light, but couldn't decide. After doing far too much reading, it seemed the most light/watts for money was to DIY.
my electrical knowledge is a GCSE electronics class 10 years ago, so I am by no means experienced with electrics! But, after a couple of hours reading it really isn't that hard it seems to make a light that's safe.
I'm using 60x60x160 secret Jardin tent, got 2 cxb3590 72v 3000k $120 from digikey, (did have to pay £35 export charge on delivery which was canny shit, but was free delivery) mean well driver hgl-185-c1400b for £60 off eBay, alpine 64cpu cooler£9.50 off amazon (1for each LED). There's some other misc. stuff you'll require, but some you may have soldering iron, wire etc.
With that will be getting 200w of good light for round about £200-£230. You can add reflectors if you want, but can pick them up cheap. I plan on adding some more 3w LEDs to fill the spectrum abit, but if you got 3500k you should be fine as has good blue spectrum. New cobs on the market are gonna change things imo, 200lm+ of light per watt on an LED!!!
If you're not sorted on a light yet I hope this may have helped, as you can get so much more for your money. I'm waiting on driver arriving then going to build it up, I'll post some pictures once sorted, see what kinda plants I can grow with them.
Marty