I would encourage you to steer clear of the buples if possible. They certainly work, but there not nearly as efficient as a newly engineered light.
Try and obtain samsung diodes, if at all possible... But regardless, stick with full spectrum diodes, that add in deep reds, and hopefully some UV+IR
If your on a budget, consider something like this:
Spider Farmer SF1000D full spectrum LED Grow Light, Samsung diodes high quality grow light, the best choice for beginer.
If your going to do a 2x4, I would simply get two of them.
or something like this:
https://www.spider-farmer.com/products/sf-2000-led-grow-light/
IMO, your actually better off going to say a 3x3 and doing something like this: The SE versions of lights are simply better units overall, and penetrate the canopy better, overall.
Spider Farmer SE3000 300W led grow lights, Samsung LM301B diodes, cover 2x2 FT(70x70cm). High efficacy and good heat dissipation, perfect for indoor grow.
Personally, I trust the
spiderfarmer brand, (and the fact that the support the forums here) but there are certainly many quality light manufactures out there as well.