What do you think would be better,
A) daisysychain two of the above together,
B) daisychain two cooltubes with homemade reflectors (as you have done),
C) Use two of these with a central spigot (see below):
I'm not a fan of Euro hoods, which is basically what these hoods from Worm's Way are. They do not have an efficient reflector shape- much of the light is reflected straight back to the tube. A double parabola aka batwing is a much more efficient shape. All light reflected from a batwing is going to the plants, not back to the lamp's tube.
Further to that, the pictured hoods don't have both inlet and outlet flanges so you can run a closed air circuit. These will take their inlet air from the room's airmass. This will make temps less stable than cooltubes on a closed air circuit and you will have to treat the exhaust air for scent, while you would not have to do so if they were getting their cool air supply from outside the room's airmass.
Also, without both inlet and outlet flanges, you won't be able to daisy-chain or 'series' them. They will have to be run in parallel with a Y-pipe to the blower.
My last complaint is that warm air has to be drawn out of the hoods and run through the blower instead of the blower pushing cool air though them. This will unnecessarily expose the blower motor to heat from the lighting, potentially shortening its life significantly.
My reflectors are not homemade; they are
Adjust-A-Wings, but the socket and movable lamp mount has been removed and replaced with cooltubes. I had the AAWs for several years before I put in the cooltubes, though. If I was going to start from scratch, I
would have made my own reflectors. AAWs are
not cheap and I'd have a hard time justifying buying a pair just to throw away half of the parts. It's very easy and much cheaper to make up a set of batwing reflectors on your own.
I was a bit iffy on how well 2x 1000W would work in seriesed cooltubes, so I did some testing in mockup on the garage floor before installing the cooltubes. I found the air temp output from 1x 1000 in a cooltube was about 6-7C higher than the intake air. With intake at 21C, the output from cooltube #1 was 27-28C. I didn't feel too bad about feeding 28C air into the second tube. Now that they are installed, with a couple of 90 deg bends in the ductwork, the output air from both cooltubes inline is about 34C.
So, my choice from your list is B.