My apologies. The H_inFlux L09 is a double-row, 128-LED, 560mm strip that is the longest in the series, and also has the most diodes. You would either need to mount two, end-to-end, and preferably wire them in parallel (to maintain 48V) for a 4' frame, or you could mount them width-ways to create a 4'x2' using the above strips across the frame (have a look at the photo below).
3000K L09 -
https://www.digikey.com.au/product-detail/en/samsung-semiconductor-inc/SL-B8V4N90LAWW/1510-2452-ND/8536581?utm_campaign=buynow&utm_medium=aggregator&WT.z_cid=ref_findchips_standard&utm_source=findchips
The F Series (like in my previous photo), do come in 4' lengths (1120mm), and are cheaper by the diode, but have slightly less efficient LM561C chips instead of the LM301B in the H_inFlux series.
3000K 4' double-row F Series here:
https://www.digikey.com.au/product-detail/en/samsung-semiconductor-inc/SI-B8VZ91B20WW/1510-2229-ND/6676693
Saying that, there's really not
that much difference in the two chips, and the F Series are excellent value.
If you used 560mm H-inFlux strips, you could mount them like this (even though these are two separate frames, together they form 4'x2' - you'd just build one frame instead of two).
These ^ frames I actually built using H Series strips. They have the same LEDs as the F Series, but they are spaced further apart. That means fewer LEDs on each strip - which is good for light and heat diffusion - but you need to buy more strips for the same power. I also needed to wire two strips in series, and then six of those in parallel, to get 48V.
12 of these 2' strips is equal to 4x F Series double row 2' strips. So each of the above frames is equal to the frame below. Exactly the same number of diodes, same voltage, total power and everything (colour is different - the one below is a 5000K veg frame). They each mount to the same HLG-240H-48A drivers.
So now you're getting the idea that you can be as creative as you like using strips, and can mount any combination in whichever way you can think of.
These frames all use standard 25mm (high) x 40mm (wide) x 3mm (thick) U-channel - you can get it cut to whatever length you need.
The other trick is to have a look at the price breaks for each series of strips: I needed to buy triple the number of H Series compared to double-row F Series to build the top frames, but got a price break at 25 strips - which made them cheaper than buying 8 F Series double rows. I used 24 strips, and they were more labour-intensive to mount.
So that's strips.
After all that, I still think you might be better off buying 4x QB96s with heatsinks and hooking them to a HLG-600. You have four scrogged plants - perfect! Hang one QB96 over each plant and you will get a nice flowering spectrum with all that red, as well as good penetration down the main stem, and good light spread between the four QBs when hung at 18-24". Just play around with the height until you can see a good, even spread of light.
Here's a tip: if you want to measure light, use an SLR camera (if you've got one) and leave it on the same shutter speed. Use centre-spot light measuring and adjust your F Stop until the point is correctly exposed. Then move it around the canopy to see which spots are brighter and which are darker. Adjust your light height until you have the most even spread. If you have a light meter, even better!