Update: I just checked the amps on turbo using fresh batteries and a clamp meter. I got ~8.75 amps at ~8.4 volts (I didn’t measure voltage, but they were fresh off the charger). So that’s 73.5 watts of power. If each LED got 1/4 of that, 18.375 watts per LED.
Strangely, I can’t find much in terms of output tests of the 90-CRI version of the LH351D. In Texas_Ace’s test of the 70-CRI version, that would translate into approx. 1800 lumens per LED for a total of 7200. Of course, being the 90-CRI version, output will be lower.
Well, I just found maukka’s output test buried in a thread. He notes that he suspected his reflow might not have been the best as his output tapered off unexpected early. Nonetheless, his test showed ~1300 lumens at that wattage. So that’s a total of 5200 lumens at worst-case scenario.