​Nope. 4000K (or rather 4100K) is the colour of moonlight. I have Ledlam 4100K LEDs all over the place - it matches sunlight quite nicely. Only anything above 5500K can be classed as "cool".

I ordered one of these a couple of weeks ago. Great price. Same price in JL, but I have prime. Almost paid 9.99 at Screwfix. Glad I checked Amazon.

Depends on the light fittings I guess, we bought a couple of multi arm light fittings to replace the B22 pendant and they so happen to need the large Edison screw bulbs.

These are the ones I bought from Toolstation >

http://www.toolstation.com/shop/p39839?table=no

Diall bulbs are ok, they are slightly older tech so tend to use more watts per lumens than Philips, Ikea bulbs.

5 x 10w for £9.99 is very cheap, they are 3000k for warm white rather than the standard 2700-2800k, 180 degree light spread, claimed life span 25k hours. Claimed lumens in 810 but if they weren't bright enough it seems unlikely they are. At that price point they will be cheap LEDs in the bulb, little to non existant heat sinks, its a low end product. No mention of CRI rating so expect it to be low, 80%+ for leading brands meaning colours look normal etc..

Why Edison screw? I have yet to be in a house that has Edison screw fixtures as standard....
Heat added...

Diall LED 15W B22 1521 Lumens from B&Q cost £10. I bought 5x10W from Toolstation for £9.99 so it seems a rip off, but it'll do the job.

Which 15w bulbs did you get?

2800k is warm white, 4000k will be like a lab and only suitable maybe for a kitchen or garage!
Where they Philips or another brand ? I've got Philips and Ikea LED bulbs, read the lumens not watts to get equivalent bulbs. I've not had problem with either of those brands but unbrand from ebay / Amazon are cheap....for a reason.

Why are they all 2500k? Will that be too yellowy?

I put 10W LED (approximate 60W light) as a single bulb in each main room, there's not enough light from them. I had to change them to 15W LED bulbs to get the right amount of light. Also cool white is horrible, like being in a science lab or morgue, so I had to change to warm white and I had to get ones with a diffuser otherwise the light was in patches which was weird too.

Wattage Equivalency 40W
Good deal but 60w is a minimum I would be after.

Same price at John Lewis

Bayonet version for £5 prime but 2-4 weeks delivery

FYI these are £6 in B&Q