Just use current control.
First choose your Serial voltage, take a safe value like 24V.
Then deduct a "voltage drop" across the regulator and "led-aging" margin of 10-15% so calculate the number of serial leds per string, for instance 6. You have then 15 or 16 paralel strings of 6 leds which is quite a lot. Each string has to have the same serial drop voltage so leds should be from the same batch a d the strings measured equally. You could add a low resistor per string of 1 ohm or lower but tthis should not be necessary with measured equal batch leds.
Electronics is the good old LM317 in current mode (see datasheet) with a potmeter.
The LM317 can be leading (24V in current to leds out) or trailing (24V to leds then to lm317 current to ground) it does not matter but do calculate max current and take care of the little heat.
If your ledstringsvoltage is much lower than the supply voltage you are heating the lm317 and the planet

Put a fuse in series for safety and if really extra a heatfuse for 80C or something.