@MMG Those are IR LEDs. Their operating voltage may be around 2 V each at the high current (should be less than a RED LED.) But I don't know because there's no datasheet or part type shown. Regardless, the huge difference between 16 V, 19 V, and 24 V will be the collector voltage for the SS8050. Which translates directly to dissipation. Of course, you say 5% duty and mention 1.7 ms max pulse duration. Which I read as about a 50 ms period or around 18-20 Hz, I guess. So the average dissipation doesn't sound high even at 24 V because of the 5%. But no LED datasheet.
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