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  Topic Review (Newest First)
07-07-2014 10:26 AM
newbieplanter
Quote:
Originally Posted by Rockhoe14er View Post
So i'm curious to try to turn my fixture into a dimmable one. I drew up a schematic of the wiring i would need to do. Can you guys look this over and tell me if i'm right or wrong? my physics is a bit rusty but i'm eager to try and learn.
I know u posted awhile ago but i would think its just like adding a on/off switch to the LEDs.
06-17-2011 05:12 PM
Dragonfish Catalina Aquarium carries empty light fixtures for DIY use. Not a bad price and looks better than any DIY fixture I've seen, including my own

http://www.catalinaaquarium.com/stor...7de34f75803405
06-17-2011 02:35 PM
Rockhoe14er I checked everything again today and it seems pretty stable and everything is working. I think the wiring is doing great. My only problem now is the shaft on my potentiometer is pretty long and i'm wondering if there is a way i can file it down some.
06-17-2011 04:20 AM
Rockhoe14er So i copied hoppy's idea and put an ammeter in series with my LED lights and it works perfectly. I can run the current from 1400 ma to 200 ma and below that the lights won't turn on. I also have a switch added to turn off just the ammeter. I use a 10k potentiometer to vary the voltage on the Mean Well ELN-60-48D dimmable driver. I'm so excited that i got this to work. know i just need to see if i can get dave to come over with his par meter so that i can adjust my lighting to reach my desired par
05-26-2011 04:10 PM
audioaficionado
Quote:
Originally Posted by Rockhoe14er View Post
well i moved the lights up even more to 40 inches above the substrate that puts me around 75 80 par at the substrate.
40° optics, dimmable circuit and an LED ammeter to track your output levels for repeatability would all be advantageous.
05-26-2011 03:20 PM
Rockhoe14er So i'm curious to try to turn my fixture into a dimmable one. I drew up a schematic of the wiring i would need to do. Can you guys look this over and tell me if i'm right or wrong? my physics is a bit rusty but i'm eager to try and learn.
05-16-2011 02:28 PM
Rockhoe14er I ended up getting a sheet of metal that's 24 inches by 36 inches. It seems pretty sturdy but still bendable so I'm going to try and fold it hot dog style (4th grade reference) and attach it in the sides of my heatsink. Also I want and drill into the bent sheet and attach my hanging kit. Do you think this will be strong enough? or will i need to build a frame inside under the metal to better reinforce the sheet metal.
05-14-2011 02:42 AM
Rockhoe14er well i moved the lights up even more to 40 inches above the substrate that puts me around 75 80 par at the substrate.
05-14-2011 01:46 AM
IWANNAGOFAST You should build that enclosure for it. That much light is not going to be good for the plants
05-14-2011 01:21 AM
audioaficionado I'm not going to build an LED fixture for my 40gal tank, but I will for my future 100+gal build. You definitely need a cowling or optics that shield your eyes from directly viewing the LED's emitter even from off angles. Cree has a warning/disclaimer about that very issue in the data sheets.
05-14-2011 12:40 AM
Dave-H It was crazy bright. The appearance of the X-PG cool white LEDs was very, very nice - a bit of shimmer and it made the plants look great. I'm very impressed! If I could find a decent enclosure (i.e. hanging one) I might have to go for this!
05-13-2011 11:48 PM
Rockhoe14er yeah it's far less around 60 par at the surface. However, it blinds me without them on.
05-13-2011 10:43 PM
IWANNAGOFAST Holy cow. that is a LOT of light!!!!!!!!!!!!!!

Might be an issue w/ 112umols at the surface! haha. Have you tried it without the optics?
05-13-2011 09:27 PM
Rockhoe14er Here are some par readings i made with my new fixture.
The red is the par value at the location.


Par measurements were also made using a ruler All 14 LED have optics

At 0 inches from light 2885 par
4 1015
8 490
12 330
16 250
20 175
24 140
28 120
30.5 112

14 LEd's are really bright as you can see and at a distance of 4 feet the par is around 40 par.

I also wanted to note that my par values are very consistent while i was moving the meter horizontally at the measurements away from the light.
05-13-2011 04:35 PM
Rockhoe14er hmmmm good point my news fans i'm using on the heat sink i bet i could create a 100 mph cooling breeze. Yes it might be a bit difficult to view the tank and keep water in the tank but totally worth it to keep my LED's nice and cold.
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