Cree Xlamp Grow-Light Schematic Design (Wanted)

[solarman]

Hi from new forum Member ( From UK )
Excellent forum been looking into making LED grow light myself for a while and found this thread very interesting!

As electricity is very expensive in the UK ( around 13p / 21cents per unit )this is of huge interest to Me so I thought I would join in the experiment ..
The 15w leds look ace great work WEEZARD

:thumbsup:

[solarman]

I have found 20w amber 585 ~ 595 nm led @ £6 ($9.64) each Clearance items was £15 Do You think they are worth a try for a first attempt ?


You help would be great ::thumbsup::hippy:

[Weezard]

I have found 20w amber 585 ~ 595 nm led @ £6 ($9.64) each Clearance items was £15 Do You think they are worth a try for a first attempt ?


You help would be great ::thumbsup::hippy:

Aloha Solarman

50 p. per Watt is a very tempting price.
I'd like to see an experiment using them.
I do have some doubts based on their wavelength.

But there's some who think they are a missing link.

If you add them, and outgrow a bi-color lamp with the same cost of operation, we all learned something good.
Even if there's no change at all, we all learned something.

Got any specs on those leds?
Would you be into logging a grow with them?
I'd subscribe and hang out on da porch for dat.

Regards,
Wee Zard

[solarman]

Here is the data sheet

http://www.electronelec.co.uk/datash...iPowerv1.0.pdf

Got 4 today + heatsing & lm317's Think the heatsrink I got is way to small but the leds look ace!

I could do with a little help choosing the right resistor for the adj voltage regs + do i need one wired for each led?
I will start building the unit this week and upload a photo !

Your help is much appreciated
Thanks
WeeZard
:thumbsup:

[solarman]

â??heatsing & lm317's Think the heatsrink â?? woops very heavy sesh last night!:wtf:


I have just ordered 2 red 2 blue 10w ledâ??s to compensate spectrum will I need a separate power supply ,I have a 15v laptop power supply ?

Cheers!

[solarman]

Doh! Iv ordered 7v 10w :jointsmile:

[Weezard]

â??heatsing & lm317's Think the heatsrink â?? woops very heavy sesh last night!:wtf:


I have just ordered 2 red 2 blue 10w ledâ??s to compensate spectrum will I need a separate power supply ,I have a 15v laptop power supply ?

Cheers!

I went over the spec sheet.
Was surprised to find errors.
They seem to have transposed the min. and typ. ratings on at least one chart. tsk!
You'd think they'd hire a spec sheet editor.
Nothing critical.

Your problem will be the LM317
Max current for the 317 series is 1.5 A.!

You can use a pass transistor with the 317, or just write it off and get a higher current voltage rectifier like the LM375.
You'll want 1.8- 1.9 A for full output.

The amber led's Vf is typ. between 10 and 11 volts so a 15V supply would do.
On the blue emitter the min. voltage is 16V. the cc supply needs about 2v. of "headroom" so a 19V. supply would be my minimum for that.
Each star will still need it's own regulator because of the high current draw.
I see you are still posting as I type.

"Doh! Iv ordered 7v 10w "

Huh? Sorry, to be so dense, but what are you saying here?

Might wanna slow down a bit, brah.
Haste makes waste.
Aloha,
Weezard

[solarman]

Sorry Weez not quite with it today
:wtf:

""Huh? Sorry, to be so dense, but what are you saying here?

Might wanna slow down a bit, brah.
Haste makes waste."""

I got 2 blue and 2 red leds and noticed the blue is 10-12v & red 6-7v ,soz to sound dumb again Im no expert do i need different power to run blues ?

â?¢ Emitted Color : Red
â?¢ 10 watt
â?¢ Intensity Typ. : 260Lm
� Viewing Angle : 160°
â?¢ Forward Voltage : 6-7V
â?¢ Forward Current : 1000mA
620~630

â?¢ Emitted Color :Blue
â?¢ 10 watt
â?¢ Intensity Typ. : 600Lm
� Viewing Angle : 160°
â?¢ Forward Voltage : 10-12V
â?¢ Forward Current : 1000mA


I did notice the 317s would not be enough Il just get the 375s thanks for the advice I would be screwed without it !

I will try and calm down a bit now been dieing to have a go at a led lamp but the high led prices kept me away until now

Thanks again for the help weezard

[Weezard]

"""Huh? Sorry, to be so dense, but what are you saying here?

Might wanna slow down a bit, brah.
Haste makes waste."


Not tryin' to harsh your creative rush here, brah.
Just sayin' buy the leds first, than sit down with a pencil and do yer figgerin' before you order the power supply parts.

No wanna admit how big a pile of unused part I have accumulated by purchasing without a solid plan.

Once your design is clear we'll figure out how to feed it, yah?
:rastasmoke:
Best
Weeze

[solarman]

Sorted mate no problem ! :thumbsup:

Well the plans coming together (A Team pun) I have found HDD cooler on flee bay that should do as my heatsink fans included only 3 Quid ...On the way

Hopefully photos attached:stoned:


In theory My future plan is to try & make led supplementary light that would work of a HID hood say 250w via solar panel ( obviously trying to run before i can walk ) .. Imagine the potential !

Whats ya thoughts Weeze ?:thumbsup:


Cheers for the help Weeze