Hi All, so I am planning new tank: 150x40x50 cm, which makes it 300 l tank. My 150 and 40 cm are "locked" options, and height could be increased/decreased, but for me 50 cm seems to be right one. As all parts can more or less be selected and bought easily, lighting is difficult one. I don't want to spend huge amounts on best known products, and other cheaper LED solutions are not available in my location due big length. So only option I have - is DIY. I have friends with knowledge on tech side, so it should be fine. But first - I need to specify what I want. So question is - how many lumens in total I need for high-light requiring plants ("high-tech" tank) for my tank? I red many forums, and I am not quite got this answer. In one place I found that 40 lumens/l is requirement to consider it high-light. Then in this case, I would need about 12000 lumens of light for my 300 l tank. Which in my calculations usually falls on 120-130 W of LED. I know that lumens are not only measure the light i look for will be: ~6500K temp. - but i will mix it - most cold white, some neutral white, some blue. - color spectrum focused on blue and red waves. - PAR - that is difficult part, usually this information not provided. So the goal will be to place light as near to water as possible and to have dimmer to reduce/increase if needed. Sorry for long text many thoughts in one place Thanks.