6 Foot LED Build

[Bryan]

Originally Posted by StirCrazy

I have a couple of each comming nutral white cool white RB and TV. right now the new trens seams to be 1NW to 2TV, the old starting point was 1CW to 1RB,
Steve

What is TV ? True Violet?

[StirCrazy]

Originally Posted by reefermadness

Personally I have 20 RB and 6 CW and it still is not nearly as blue as my 20k Radium. Those cool whites are super yellow and need tons of blue to wash it out. I would have gone more at least 3 RB to each CW.....but I like it 20k +actinic look.

To me a 50/50 is no where near 14k. The 2:1 ratio of RB to CW is more like 14k to me.

what kind of LEDs are you using and what batch number did you get for your cool whites? the good ones are 6500 to 8000K which has no yellow at all. at worst they are 6500K, which still shouldn't have any yellow. any bin number for "cool white" should give you a white with a slight tinge of blue.. kinda like a ice white for the lower batches and a real light blue for the good batch numbers.. now this is for the older ones and I notice that some of the newer ones are down to 5000K for the bottom end of the range but this should still not show any yellow. nutral white might have a tinge of yellow, but the warm white is where you should get your yellow.

[lastlight]

Originally Posted by reefermadness

Personally I have 20 RB and 6 CW and it still is not nearly as blue as my 20k Radium.

Is that Radium on an electronic ballast? On a M80 I find it to be blue certainly but much closer to white/blue than other 20k bulbs I have seen...

[reefermadness]

Originally Posted by StirCrazy

what kind of LEDs are you using and what batch number did you get for your cool whites? the good ones are 6500 to 8000K which has no yellow at all. at worst they are 6500K, which still shouldn't have any yellow. any bin number for "cool white" should give you a white with a slight tinge of blue.. kinda like a ice white for the lower batches and a real light blue for the good batch numbers.. now this is for the older ones and I notice that some of the newer ones are down to 5000K for the bottom end of the range but this should still not show any yellow. nutral white might have a tinge of yellow, but the warm white is where you should get your yellow.

I got my Cree XP-G Cool Whites from rapidled. I ordered two different times and both look about the same in colouration. Sorry I don't know the BIN numbers on them. To me they should be called warm white.

If you go back and look at the old 6500 MH people used...they are not pure white either, they definately had yellow. A pure white is more like 10k....and think of an XM 10k bulb, that IS white.

Anyway they list these LEDs at 5000-8300k. To me this range is not pure white and either are the LEDs.

Originally Posted by lastlight

Is that Radium on an electronic ballast? On a M80 I find it to be blue certainly but much closer to white/blue than other 20k bulbs I have seen...

My radium is not on an electronic. Its on a magnetic ballast but not the M80 because it's 400w. With just the MH running...I don't find it all that blue.

[StirCrazy]

Originally Posted by reefermadness

Anyway they list these LEDs at 5000-8300k. To me this range is not pure white and either are the LEDs.

.

thats weird, the 6500K LEDs I played for when I was lighting my matis tank were white. I switched to a 10000K LED and it was a light blue. almost makes me wonder if some of these companies are buying seconds to keep the cost down while making a profit.

now my playing has been with the XR-E's so maybe the newer ones put out more yellow in comparason as they have a higher output. this would require more blue to offset the white element so that could be it also.

Steve