After been using all your good advice to other peoples projects its now my time to ask. Thank you for allways being really helpfull in this forum.
Being a noob like me sometimes makes it hard to ask the right question, so instead I'll try to explain what I want to archieve.
I'm gonna build a led-grow-panel. I bought 20 3w, 700ma leds in different colours(=different voltage needs).
I also bought some cheap constant-current step-down led drivers which allows me to set the output voltage (like these https://a.aliexpress.com/FB0AKvHm). The idea is to have 4 strings of 5 leds in series (=voltage needs of about 14-16 v in each string, depending on the colours in that string).
Then I was about to buy a decent powersupply with decent current (since it'll be driving other parts of the project simultaniously). I won't be buying cheap high-voltage-stuff as I'm too nervous of the firehazard of the cheap stuff. So it turned out to be rather expensive. Then I found my old X-box 360 power supply which is able to drive 16,5a 12v. 12v is great for the other parts of my project, the current-ratings are well on the safe side (and its free) so I'm gonna stick with that.
To drive the led-strings I would need approx. 18v (because of the consumption from the led-driver). So I was thinking of adding a step-up-booster like this:
12v psu -> 18v step up -> cc led driver -> led
Just seems silly to step down-step up-step down. And I cant really seem to find cheap high current/wattage step-up-modules that's not constant current.
So to make a long story short: I have a 12v16,5a psu and i want to drive 20 3w 700ma leds with different voltage ratings.What would your approach be?
Thank so much for your help.