I'm wondering what I should include in my video which will feature the new LED fixture I bought on 6-24-2014.  If you have any ideas that you'd like me to consider, let me know below.

heres the fixture I bought

this fixture with "full spectrum" lighting is usually used for coral, but it will be good enough for planted tanks.  Also I prefer less green color in my tank so this is good for me. Given that i can vary intensities of blue channel to the mixed color LEDs  I can tailor the color. 

EDIT:

This fixture does not include additional optics due to my desire to want 120 - 130 degree spread of light.  This one fixture will light my 50 gallon tank.  Dimensions of rectangular aquascaping portion of the tank is 35.5" x 10.125" x 19 " (L x W x H)  Due to substrate height 19" will be 17" giving my tank 26.45 gal to scape; however, there are two triangular prism volumes which equates to 2.14 gal for a grand total of scapeing volume of 28.59 gal.  SeaClear System II is labeled as 50 gallons.  Outer dimensions actually give 46 gal.  Inner dimensions give 42 gal.  Labeling is absurd in marketing.  I recommend to stick to standard glass tanks.

If i can borrow or rent a par meter Ill also do par measurements outside and inside a tank.

Happy tanking.

LED

PS here are some terminology meanings ( ask me more for if you need them)

  • potentiometer = dimmer

Views: 350

Comment by LED on June 25, 2014 at 4:42pm

Gareth asked to include temp, algae, plant growth, etc.

Comment by LED on June 25, 2014 at 4:43pm

Ill include dimensions of the tank somtime tonight or tomorrow given that I'm at Google I/O extended event.

Comment by LED on June 25, 2014 at 4:45pm
Comment by T on June 25, 2014 at 4:46pm

List the plant species you will be using as well as others that this fixture will work with.

Comment by LED on June 25, 2014 at 4:51pm

Based on calculations I would assume this particular fixture would work over any 3 gallon to 75 gallon that would  accommodate its spread.  normally we get fixtures to accommodate the tank so I would be working backward.  Ill try and see which standard tanks this will work on.

Comment by LED on June 25, 2014 at 4:58pm

pardon me I meant 30 gallon

Comment by LED on June 25, 2014 at 5:28pm

whats great now is that post is from 2009.  there are so many changes in pricing now that I was able to purchase my fixture for 82 dollars.  So many people can purchase one of these.

Comment by LED on June 26, 2014 at 5:09am

Alright before im going to bed Ill do a lil update.  I did an unboxing video, initial  plug and play test video, and some measurements which i simply took pictures of since I did the temperature measurements over the course of 1 hour.

Ill upload the videos later this week since I'm busy with Google I/O ending Thursday.

I did not do readings at 50% light output since color temperatures may be greater than 500 K color temp lower.  Instead I tested at 75% and 100% according to the potentiometer markings.

Also to note the fans DO NOT  turn on untill 50% pot markings.  Very stupid to do.  However the lights do turn on at 10% pot marking.

Now for the some running temp info

Materials:

  •  two thermometers with continuous output and resolution of 0.1F
  •  thermometer on heatsink of light fixture was wrapped and smashed with 18 layers on top and 18 layers on bottom with standard Reynolds Wrap which is 16.26µm (micrometers) thick. Therefore the thermometer had 292.68µm or nearly 0.3 milimeters of aluminum between the thermometer end and the heatsink.  
  • To further increase thermal conductivity I had a fork's back end press down on the thermometers tip onto the heatsink.  I would venture to say there was at least 1 lb of pressure on the forks surface area of a little under 1 inch.
  • I used the tip of the thermometer due to the thermocouple located at the tip.

Now the test.

I ran tests in my bedroom which is usually the warmest room in the apartment. My ambient room temperature was 74.4F degrees for the 75% readings over 30 mins.

There is an 11 F increase in temperature from ambient temp which is quite nice.  The temperature fluctuations over the 30 mins were equal to or less than 0.2F with an equal fluctuation in ambient temperature.

At 100% pot markings I had an ambient temp of 75.1F and fixture heatsink temp of  95.5F after 30 mins of measurement.  The fluctuations in ambient temp were about 0.2 F and and heat sink temp stayed constant, therefore my thermocouple didn't see variations over 0.1F

With a 20.4 temp increase from ambient this is also acceptable for inside the apartment; however, I am not as confident using this fixture outside given Northern California's temperature swings.  The operating temperature range for this fixture is reported by the seller as -20 to 40 C  Id be better off in winter or mountains of California

Ill do more measurements for temperature but for outside once i have a working suspension system over the 50 gallon tank.  (also dimensions for the tank will be posted later when I have time)

Comment by LED on June 26, 2014 at 5:12am

I DO NOT  see any zener diodes on this board nor on the back which is simply a flat surface heatsink (bad design but seems to work for now)

Comment by LED on June 30, 2014 at 4:15pm

So i did a test outside and its 92.3 F outside in the shade, and the heatsink on the LED is 102.3.  If it the temps outside get any hotter then i technically shouldnt use it oustside since running temp is 105F max

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