The specs of these light sounds pretty good. A vert4 in the veg chamber with 4000°k would have more than enough blue and the vert8 looks like they have mixed warm and cool-white spectrum and have added deep red to the mix.
The only thing I don't like is the lens cover they use to get IP65 ratings. Most LED's have 120°(also these Duris M or S5 from Osram) and even the best optic pmma has only 95% transmission. This means you would get ~5% better efficiency when you remove the lens cover. That's a lot and would lead to ~2,57μMol/J.
When they are willing to customize the spectrum ask them for Osrams new Square series deep reds to increase efficiency even more. I'm pretty sure you can boost it in the same range with the new spider2i.
Do you know Amare's new bar8? As the name suggests, it's also a fixture with 8 crossbars but it offers even more flexibility cause you can use the bars separately or split it just in half.
They already use Square series deep red and reach 2,7μMol/J with added pmma cover. Without cover you would get probably 2,84 or more. That's f..(#iπ& crazy.
What's the price compared to the spider2i? As a rui member you can get a huge discount on the bar8. I believe you safe ~500 bucks, 1200 instead of 1700$ or something like that.
There is a thread about the Amare bar8 here in the LED section. Really interesting! Together with fluence spider2i probably the best you can get currently.. And with such a huge discount it's a no brainer!
You could also build your own fixture to beat that numbers. Samsungs new horti strip has 2,74μMol/J at 1,2amps(~51,7w net). Run them at half current(23-25w) and they scratch already at the 3,0μMol/J limit. Add a few Square series deep reds and they would break the 3,0 mark probably.
Cree's new XP-E2 in deep red reach almost the same level of efficiency and it's easier to order top bins. Osram has a limited selection system and it's hard to get the brightest binning. But to DIY something that beats the bar8 in terms of output and efficiency 1200$ is pretty tight budget.
