The most deceptive thing about light is that it can appear bright to the human eye but not actually be strong enough to grow plants. This is a function of how our eyes perceive different wavelengths, vis a vis the Photosynthetically Active Radiation (PAR) that plants use for photosynthesis.
The common 'simple fish tank' seems to conform to a standard basic setup that works. While it can indeed function, it is also ironically the hard way to maintain a thriving, algae-free tank. This is why.
While 2Hr Tanks are known for their resilience against algae, but there are still occasions where we face algae problems. We share an example of a tank that was planted prematurely- before proper cycling.