Hi Clive,
I have been searching for par readings, but I cant find them for the 10.000k version of this unit.
I know that you cannot see par with your naked eye, but when the lights are at 24% its way to dark for a normal aqaurium level, its light level is as if the sun has just come up.
It could be offcourse that there is tons of par, but I do not see hardly any growth in even the already submerged Hygrophilia Polysperma that have been put in from a other tank at 24%, at 30% it grew quite alot in a week, approx 10cm.
Sanj has almost the same unit and somewhat same sized tank, but it has one led cluster less and 40w less, he runs it on 55% at averge with a peak at 60%.
At the moment my impatience has gone away completely, light (24%) and temperature (22C) levels are low, ~50% water changes every other day and dosing EI everyday.
5kg FE bottle has been changed this morning as it was empty already 8)
My lights do not start and stop at 24%, it takes two hours for them to build up to 24% (linear pattern) and one hour to go down to 0. Light is on 8.5 hours a day.
I have a bit of surface scum, not really thick, it does not smell funky either, you can get some of it of with a fine net, its then brown colored, as it was diatoms.
My spraybars are spraying less horizontal, they still hit the glass but now about 2/3 of the tank when there is no water there, maybee it helps with the diatoms on the wood.
I still have a circular flow, thinking of adding a powerhead to get some more flow behind the wooden hardscape and the rear glass.
as always, thank you very much for thinking for me and helping me out!
Have a nice day!
Lexy