The Philips 965s should be fine. My understanding is they don't contain the UV component that Narva BioVitals do. Lampspecs also sell the Philips Activiva natural, which is an 8,000k like the Skywhite was. I'm confused by the wattages however, as they don't match up to T5HO standard wattages (24, 39, 54, 80), really strange wattages, even on the HE ones.
Hopefully I wont get shot for saying this, but it might be worth waiting to see the new Arcadia Freshwater Pro. Now please folks, don't shoot me for actually suggesting a hobby branded bulb... I am doing so because I got the chance to try a couple pre-release. Given that the Skywhites aren't available now, a few people might quite like them. They're 6,700k, but the light is a LOT less yellow than an 865 or a BioVital, and colour rendition is really good. Judge for yourself, these are of a viv, not an aquarium, but will give you the gist.
865+Narva Biovital
Quite a yellow hue, including to the human eye I found.
Ok, need to use 2 pics to demonstrate the FWP. The first is using 2 FWPs, but the doors are filthy and they were just too dazzling used together:-
The next one is a better shot, but in this instance the left hand tube is a D3 6% UV Reptile lamp:-
They both have a very similar output visually however, and you can see they are a lot less yellow looking. I can't however comment how well they will do for plant growth, as only just fitted them. Plus this is on a viv, not an aquarium.
I am not for one second saying these are better for plant growth, not for one second. My liking of them is purely based on the visual side of things. Plant growth wise, there are lots of much cheaper tubes you can use. Heck for ages I used GroLux and 865s before swtiching to GroLux and 880s as I got fed up of the golden hue. lol All I am doing is putting the idea out there.
Are they worth £16 and up? That's up to the person buying them really. I have ALWAYS used cheaper tubes in the past, and always slated Arcadia aquarium lighting, until I saw these new ones in the flesh. I still can't put my hand on my heart and say they are worth the cost, as to me sure, but to somebody else they'd laugh me out of the room.
Ade