Quote Originally Posted by LedElk
I just checked and I-max is indeed at 1A.

No need to risk more problems, right? I'll probably re-route one of the LEDs to a third 35w driver. That makes room for 30w extra worth of LEDs

Quite right!
There's some interpretation needed with the spec. sheets.
If you read them carefully, you will find some interesting gotchas.

Fer instance, it may not be possible on some emitters to even sneak up on I-max.
The nominal junction drop is is just that, nominal.
There's plenty of wiggle room around that target voltage and the actual voltage drop will vary with the emitters, and over time.
I measured all my emitter drops and designed for the weakest link.

Current regulator regulate current by adjusting the voltage applied to your load.

Here's the fun part:
I might not be possible to drive some emitters to I-max, because doing so would exceed V-max.
My 15 Watt leds have an I-max of 1.5A.
That's 10 Volts to keep the math happy.

One of my emitters was hitting 10V. across the junction at 1.4A.
So, I locked 'em all down at ~1.2 Amps.
That seems to be the "sweet spot" for photon efficacy.

My 150 Watt array became a 120 Watt array.
Driving it "balls to the wall" would take another 25% in power.
But would deliver less than 10% more photons.
And it would drastically reduce the useful life of the assembly.

Why am I bothering you with this?

"That makes room for 30w extra worth of LEDs"

No headroom!
Max Headroom says, "ya gotta have it."
So, maybe another 25W. yah?

Meanwhile, your plants are looking good.

Aloha,
Weeze