My assessment of the light color 840 (neutral white): is really very white, but this very cool, rude, sober. Wanted to use them for my hobby basement workshop. So I'm not coped as were previously 827er it. With the 840ern really comes down to no comfort, compared to previously, the light seemed even slightly greenish ago. Property me now bought 830, which is a very good compromise.
I would really recommend the 840 only as a pure working light, if you want to completely forego comfort.