My Cxa3070 cree cob build Frankensteined with a Marshydro

Thanks for the help from several RIU led guys , I have almost completed building a cree cob cxa3070 light fixture that will hang across my marshydro 300,, maybe someone could give me an estimate on lumens, my guess is around 21,000 to 24000 lumens? I have a cab build thread going on over in indoor stealth micro cab, this thread is just about the cob led light / mars join

more build pictures , i took the glass out of the mars light, and replaced the fan with quieter fans

more build pics

drivers chosen

the specs are clearly seen here

thermal paste, and heat sinks, artic 11's

i purchased a variable voltage power supply for the fans, so I can drive them at differant voltages and hopefully select a setting that is quiet, some people report running them at 5 volts is nice and quiet

heat sinks drilled and tapped, also cross drilled for mounting bolts, and aluminum frame work cutting and drilling has began

frame bolted together and a test fit across the mars housing

mounting the cobs, wipped the thermal paste on thin with a razor blade, and there you have the frame with the cobs mounted to the heat sinks

installed inline automotive fuses, with 30 amp fuses for safety

HOLY SHIT,, you guys told me they would be bright, but i was not prepared for this, its like looking at the sun, you cant for just a split second and then your going blind, freakin amazin

Cool build, thanks for sharing. Watch out for that diy bug..lol

and finally all three led's hanging together, this is going into my 3 foot x 2 foot wardrobe cab, its 6 feet tall

i still need to wire up the pc fans on the cobs, I will probably do that next thursday, my clones will be ready in a couple more weeks, its time to grow, I will post pictures of the fan install and wiring next week, I wonder how many watts I am pulling actual watts, mars claims their light is 175-180 watts, so what is 2 cree cobs?, and any guesses on my total lumens?,, mars says thier light is 7900 lumens, so what are the 2 cree cobs?

Tim Fox said:

i still need to wire up the pc fans on the cobs, I will probably do that next thursday, my clones will be ready in a couple more weeks, its time to grow, I will post pictures of the fan install and wiring next week, I wonder how many watts I am pulling actual watts, mars claims their light is 175-180 watts, so what is 2 cree cobs?, and any guesses on my total lumens?,, mars says thier light is 7900 lumens, so what are the 2 cree cobs?

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Your wife must be feeling better, TIM! That is good! Glad to see you almost there

Should be around 7100 lumen's each, but better yet....1.4 amps x 37.3 volts = 52 watts

Cree = 104 ish watts @42% efficiency equals roughly 43-44 PAR watts...
Mars = is kind of a guess...lets say 30% @170? watts = 51 PAR watts
-about the same amount of PAR watts, but it takes 58% more energy from the Mars to equal your Cree's!!!!!!!

Remember this about lumens, they are a photometric measurement, so a measure of how light is seen by the eye, not necessarily all light....
Heavy blues can skew a Lumen count since blues will have more lumens than red spectrums...So you could have two different lamps, drawing different wattages, but output the same lumens....One is skewed towards blue and using less power, one is skewed towards red and using more power....not a good indicator at all....

Tim Fox said:

i still need to wire up the pc fans on the cobs, I will probably do that next thursday, my clones will be ready in a couple more weeks, its time to grow, I will post pictures of the fan install and wiring next week, I wonder how many watts I am pulling actual watts, mars claims their light is 175-180 watts, so what is 2 cree cobs?, and any guesses on my total lumens?,, mars says thier light is 7900 lumens, so what are the 2 cree cobs?

Click to expand...

Great Mars modification mine didn't go so well lol

Tim Fox said:

View attachment 3414670 HOLY SHIT,, you guys told me they would be bright, but i was not prepared for this, its like looking at the sun, you cant for just a split second and then your going blind, freakin amazin

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Lol dont stare into them no more unless you like that blue hue vision for hours after that haha. I cant wait to build mine! Gotta get rid of my 1k hps already

i did that to my xbox 360 few years back. best part was when i friend came thru n seen it, he offered me money for some parts. fuck yea! i got that same mars 900 panel too, i might just bust it up lol

Nice work mang