Why not just use a separate power supply for your extra LED's?

That's a good suggestion, I have been considering it myself, but Jürgen guessed correctly - I don't want to lose the ability to have the LEDs software dimmed by the printer itself. 

If 8-9W should prove insufficient, I'd probably add a small external PCB with a MOSFET that uses the LED connector from the printer board as a control signal. But I doubt that will be necessary.

Posted by: @jurgen-7

Posted by: @bowtie6

LOL!  Longevity.  These things are so cheap!!  I could care less about that - just replace with a new one.  

Look, it's pretty straightforward: I am not trying to talk you into or out of something. Build whatever you like. I only gave a possible answer to a question you asked. Before you start insulting someone next, why can't you just leave it at that?

I am not insulting anyone.  I gave an idea - never said you must do it.  I have that on my printer and I like it.  But enough.  I am not arguing with you, I have infinetely better things to do!  :)

LOL!  Longevity.  These things are so cheap!!  I could care less about that - just replace with a new one.  

Look, it's pretty straightforward: I am not trying to talk you into or out of something. Build whatever you like. I only gave a possible answer to a question you asked. Before you start insulting someone next, why can't you just leave it at that?

No dimming.  I don't need that - lights either on or off.  Its an LED strip after all - so power consumption is not an issue. 

Sure, but maybe longevity could become an issue --  depends on how well you can heatsink the LEDs.

It looks like they are using either "MMBF170-7-F" (onsemi, 500mA) or MMFTN170 (diotec, 500mA) if I understand the text near the part correctly. 

Oh right -- I should have read the small print... 😉 

Why not just use a separate power supply for your extra LED's?   

To get the benefit of automatic dimming?

I posted all this here:  https://forum.prusa3d.com/forum/user-mods/core-one-led-light-strips/#post-778387

It looks like they are using either "MMBF170-7-F" (onsemi, 500mA) or MMFTN170 (diotec, 500mA) if I understand the text near the part correctly. So either way it seems to be 500mA - which still is a limit I'd rather not push, especially with SOT-23-3 which are not amazing for heatsinking. 

But this gives me an upper ceiling to work with, and 24V 0,4A would still be 9,6W which is already more light than I'd realistically want inside a 3D printer. I mainly want to spread the light out a little (one strip top left, one top right, one where the original one is) to get more even lighting - helps noticing flaws or warping off the bed.