I agree with mannitu, the lm281 is a very viable option for grow lights at the moment. While the 301h is undoubtedly the top light, it is in high demand so the prices are high. Less efficient, but still very efficient in relative to history, lights like Bridgelux, Nichon and the lm281 provide a really nice $/wattage ratio.
I have 2 Kingbrite qb style lights, both 240w but 1 with 301h and the other with 281's. The 301h board also has Cree IR and FR as well as LG UV while the lm281 board has Epistar FR and no name IR and UV. Also the 301h has a Meanwell driver and the lm281 has a no name. I got the lm281 light second because I wanted better coverage after getting a new tent and I am cheap. The lm281 was only 75$ + shipping.
I was expecting a significant difference and figured I would have to run the lm281 a little harder to compensate. The reality is they are very close is output. The plants don't favor either one with both at 100w. Using an app on my iPhone gets similar readings with the 301h having a slight advantage.
The only difference is the plants under the lm281 are more squat and bushy while the ones under the 301h stretched out more. The 301h board has 3000k and 3500k diodes and the lm281 board has 5000k and 2700k diodes, so the difference in color temp was likely responsible for the plant differences.
That's my experience with the diodes and I'm happy with the lm281 light. My biggest complaint is the no name driver, I just don't trust it like I do Meanwell. The no name driver runs hotter but not by much. One of my rules of diy over the years has been to never skimp on the power supply part of anything so I hope that doesn't bite me in the butt on day.
TLDR: The less expensive diodes, like lm281, Brideglux, etc, are great alternatives right now with 301h in high demand. It's all about the flower in the end.