Off grid LED solar lighting without batteries
Boost or buck converters may not be a good choice for direct-from-sun applications.

They draw more current as the input voltage gets lower. Hence, at the instant when the solar panel does (even for a brief moment) not provide enough power to drive your LEDs at the (maximum!) power you set the converters will quickly spiral the voltage down and your LEDs turn off. Yes, even if the panel only sags to 98% of the LEDs' power demand, the LEDs will turn off.

Also be prepared that a solar panel is much more sensitive to changes in insolation than the human eye. You may find that you hardly notice the difference between 100% and 50% absolute insolation while for the solar panel it already makes 50% of a difference. Don't be disappointed if you only get 10-50% of the rated power out of a solar panel on a seemingly nice sunny day; consider that when dimensioning your system. Maybe do some tests (with smaller panels) and see how much of the rated power you get in weather conditions you consider somewhat average for your location/time of year/day.