Sofirn C01R deep red [sold out, discontinued]

Not just a bit, the human eye is 6 times! more sensitive to 620nm compared to 660nm (link). So you need 6 times the radiometric power for 660nm to get the same brighness as 620nm light, or the other way around, at the same radiometric power 660nm appears 6 times as dim.The crimson is lovely but it comes at great costs.