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Topic Review (Newest First)
06-15-2011 02:26 AM
redfishsc
Quote:
Originally Posted by BlueJack View Post
Quick question...I have two of those 12 smd led bulbs over my fluval edge. I think they're .25 watts each smd? I haven't been able to grow anything with those, even low light plants. They basically just have enough power to keep things alive but not growing. Why is that? I know it's because they aren't putting out enough light, but what's the difference between the .25 watt smd's and 1-3 watt smd?
Quote:
Originally Posted by BlueJack View Post
^Added to above question. I know chlorophylls a, cē, and peridinin have a "sweet spot" for using Photosynthetically Active Radiation between 465nm-485nm. That is pretty much where LED's have a good drop off. Would this lack of PAR "spike" be a reason for my stunted growth?
I would recommend you start a fresh thread on this so that you can get more responses, but in a nutshell, here's my take on this.


*Those low output 1/4 watt LEDs are not nearly as efficient as better-brand 3-watt class LEDs (Cree, Luxeon, Bridgelux). That's part of the reason they aren't working for you.

*The low-output LEDs are also nowhere near the power (literally 12-20X less powerful, per LED) than the 3-w class. They just don't put out much light for plants. That's the other reason they aren't working for you.

Basically, they are just too dim unless you use massive numbers of them.

You mention the 460nm color spectrum (blue) but honestly most white LEDs I've graphed on a radiometer show a considerable spike in that exact region.
06-15-2011 02:12 AM
Steve001 The first setup.
06-14-2011 10:59 PM
BlueJack
Quote:
Originally Posted by Jerrayy View Post
I like the first set-up the best, as the greens are nice and crisp.
there is also nice contrast between plants and darker substrate
I think so too..it looks the most natural. The others have an artificial(pinkish) feel.
06-14-2011 10:10 PM
Jerrayy I like the first set-up the best, as the greens are nice and crisp.
there is also nice contrast between plants and darker substrate
06-14-2011 09:47 PM
BlueJack What do you think is the best looking mix of bulbs? Arranged respectively from front to back:

Life-Glo (6700k)+ GE Aquarays (9325k) + Zoomed UltraSun (6500k)


GE Aquaray (9325k) + Zoomed UltraSun (6500k) + Zoomed FloraSun(5000k)
06-11-2011 02:46 AM
BlueJack ^Added to above question. I know chlorophylls a, cē, and peridinin have a "sweet spot" for using Photosynthetically Active Radiation between 465nm-485nm. That is pretty much where LED's have a good drop off. Would this lack of PAR "spike" be a reason for my stunted growth?
06-10-2011 09:09 PM
BlueJack Quick question...I have two of those 12 smd led bulbs over my fluval edge. I think they're .25 watts each smd? I haven't been able to grow anything with those, even low light plants. They basically just have enough power to keep things alive but not growing. Why is that? I know it's because they aren't putting out enough light, but what's the difference between the .25 watt smd's and 1-3 watt smd?
06-10-2011 09:03 PM
BlueJack Those look great! Here's the spectrum of those LED's in different kelvin temperatures

cree xre


cree xpg
06-10-2011 08:50 PM
redfishsc For those who missed it, I was able to get some graphs of LEDs that we use on custom DIY rigs.

http://www.plantedtank.net/forums/li...r-planted.html


Here's a couple just to whet the palate. Notice the lack of spikes in the curve other than blue.



06-10-2011 06:26 PM
HolyAngel Hmm Ill have to try that on my 5 and 15gal tanks then.. Too bad they don't make one for t5ho
06-10-2011 05:46 PM
BlueJack
Quote:
Originally Posted by HolyAngel View Post
So out of the Hagen bulbs, it looks like the aqua bulb puts out the most useable par? That's something I didn't know.. Those are the t8's right?
Yep, I've had those and they have a very unique color to them. I don't know how to describe it. It's almost a blueish pink color. It looks like it has a similar spectrum to the Sylvania Gro-lux just at a much higher Kelvin.

06-10-2011 05:08 PM
HolyAngel So out of the Hagen bulbs, it looks like the aqua bulb puts out the most useable par? That's something I didn't know.. Those are the t8's right?
06-09-2011 04:35 AM
BlueJack Thanks!
06-09-2011 02:51 AM
HolyAngel Very nice! I've actually done a bit of this myself when I was experimenting with multiple bulbs, now I run flora suns only in all my fixtures, t8 ODNO and t5ho. If you don't mind the pinkish hue the plant growth is awesome.

Thanks for all the info though! Im going to continue to look over this for awhile :p
06-09-2011 02:44 AM
BlueJack Thanks for checking this out!
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