I am new here but used 2 of the 450 non dimmable reflector series in a 4x4 tent. I grew 3 plants to 2’ tall pretty easy. Then found out all 3 were male. So I have not gotten to the flower stage. I am now using both 450s over 2 plants and a 300 over another plant for this grow. All viparspectras. I am happy with them.