Lighting K-Value for Controlling Blue-green Algae

[Larry Little]

Hello All --

Its been awhile since I was last on the site. Hope everyone are well. I'm still struggling with blue-green algae in 2 of my tanks. I've replaced my light bulbs with 6500K bulbs. I don't really understand K-value as I've always dealt with foot-candles and color spectrum.

Any help would be greatly appreciated. Thanks

 

[coralbandit]

6500k is correct for freshwater plants.
What is your lighting cycle? It could be the time the lights are on is too long .
Where in tank does algae grow [top middle bottom]?