LED lights. What brand and why? what is the best LED diode? just the samsung ones? LM301

Just buy the best you can afford... You get what you pay for with LED. So yes, spider farmer and mars hydro are great and good enough for growing... Spend the extra money on a well reviewed and documented brand and you will see the difference. Adding extra types of spectrum can improve your grow. UV, extra IR units. T8 6500K fluorescents during veg. U could combine all with what you have, with other lighting types to better you spectrum at a lower cost. End of the day money talks. Gravita Pro at £1500...and they are awesome. Same as the zues pro by Lumatek...both are amzing lights that give great results. I hope this helps in some way. Good luck and happy growing