General DIY LED thread

[oreo54]

Now would adding a PC Amber or Amber and or a few Mints not be good enough to almost replicate that ?

Yea .except in fluorescents and mh's the green and amber spike from mercury is " crisp". LEDs have a much wider spread.

 

[skyrne_isk]

Yea .except in fluorescents and mh's the green and amber spike from mercury is " crisp". LEDs have a much wider spread.

I’ve got cyan in the mix, will go with some more 450 and a 4k white and see if it comes out right. At the minimum, you’ve confirmed that full spectrum diode isn’t what I want, that there isn’t an easy purple/violet diode to just add and what colors to mix to replicate. Thanks!

 

[oreo54]

I mean which colors of LEDs do I have to use to make full spectrum, like the link I shared @oreo54

Sorry you got kind of lost..... not sure what you are exactly asking here.

BUT first, not sure of the wisdom of using JB weld to attach leds to anything.
Things like "Heatsink Plaster" are cheap and readily available. 1 part Thermal conductive silicone glue.
There are other brands.

Driver would depend on if and how you want to dim/control it(global or nothing)/channels(number,length).
As to "full spectrum" that's sort of a fluid concept apparently. "Here" many consider full spectrum having a UV/IR compliment and everything in between.
Ignoring that all white leds are "full spectrum" but not a good full spectrum as to real world look.

 

[oreo54]

Hi can you make this spectrum using these

I am following this tutorial and the persone on it said '' if you swap out the reds leds to royal blues it makes a good reef light. also tell me what led driver i can use

This is probably one of the cheapest ways to drive and control 3w leds..
Believe the thermal switch (really optional) should be normally closed not open.
With a 36V power supply and using LDD's you are limited to a total voltage per string of 33V approx.
3V is "unavailable".
Say you have a blue led that is 3.7V @ 700mA..... 33V - (3.7V X 8) = 3.4v extra.
You do have to open the tc-420 (or 421 wi fi) and solder the dim control wires to a certain spot.
see yellow wire below.

 

[keepingfishwithnoidea]

THanks bro this helped alot but how do you know if ur light has a good spectrum?

 

[skyrne_isk]

Can anyone tell me what these things are on the board? And more importantly, if they can be replaced :/ Let’s not ask why.

 

[oreo54]

Can anyone tell me what these things are on the board? And more importantly, if they can be replaced :/ Let’s not ask why.

Those are what passes electricity if the led fails open.
Without them if one led "died" the whole string would go dark.
"Think" they are Zener diodes. Sure looks like Zeners..;)

I could be completely wrong since I haven't found any proof of this at all.. which is odd.
Never mind.. my google-fu is a bit broken today.. apparently my algorithm is corrupted.. :)
Had to refine my search terms.
Anyways some "proof of concept"

https://www.eevblog.com/forum/beginners/zener-in-parallel-with-led/

If across a white or blue led more than likely the Zener is one that conducts around 3.9V.
The Zener conduction voltage needs to be higher than the LEDs V(f).

 

[skyrne_isk]

Those are what passes electricity if the led fails open.
Without them if one led "died" the whole string would go dark.
"Think" they are Zener diodes. Sure looks like Zeners..;)

I could be completely wrong since I haven't found any proof of this at all.. which is odd.
Never mind.. my google-fu is a bit broken today.. apparently my algorithm is corrupted.. :)
Had to refine my search terms.
Anyways some "proof of concept"

https://www.eevblog.com/forum/beginners/zener-in-parallel-with-led/

If across a white or blue led more than likely the Zener is one that conducts around 3.9V.
The Zener conduction voltage needs to be higher than the LEDs V(f).

K. So something like this would be good for replace? I didn’t look up every diode on the circuit, but yeah all white/blue/uv/cyan. 3w

 

[oreo54]

K. So something like this would be good for replace? I didn’t look up every diode on the circuit, but yeah all white/blue/uv/cyan. 3w

You may need different size for UV .. v( f) can be around 4v.. well historically they were.
Most currently list top v(f) of 3.8v