raeh1 Posted April 6, 2006 Report Share Posted April 6, 2006 I have an acardia 150 metal halide and two 2 foot marine blue lamps. If I put a 20,000k bulb into it. Could I add two 2 foot T5's (mates a electrican) without having to little blue light in may tank. My aim would be to upgrade the metal halide to 250 watt 20,000k next year. I welcome your ideas Quote Link to comment Share on other sites More sharing options...
suphew Posted April 6, 2006 Report Share Posted April 6, 2006 I tried a 20,000k bulb and found it far to blue, also they arn't as bright, I had a 14,000k and 20,000k going one at each end of the tank, there is a lot of differnce in brightness. Not saying it wont be fine in your tank, just letting you know, esp if you are planning on going 250 cause you need more light. Quote Link to comment Share on other sites More sharing options...
ghostface Posted April 7, 2006 Report Share Posted April 7, 2006 if its your only bulb, id go for no higher than 14k. the difference in brightness between the 20 and the 14 will be heaps. i have a 10k in middle and 14k either side, and the difference between them is massive, 10k is about twice as bright Quote Link to comment Share on other sites More sharing options...
HelifaxNZ Posted April 7, 2006 Report Share Posted April 7, 2006 Hmm... This is good to know. Quote Link to comment Share on other sites More sharing options...
chimera Posted April 7, 2006 Report Share Posted April 7, 2006 if its your only bulb, id go for no higher than 14k. the difference in brightness between the 20 and the 14 will be heaps. i have a 10k in middle and 14k either side, and the difference between them is massive, 10k is about twice as bright differs between bulb manufacturers. personally i think its only because of the colour difference that it makes the 10k (yellow) appear brighter than the 14k (blue/white) i get much less algae under the 14k's and would definately go with them again Quote Link to comment Share on other sites More sharing options...
ghostface Posted April 7, 2006 Report Share Posted April 7, 2006 differs between bulb manufacturers. yeah my 14ks are cheap, and the 10k is pricey - can rem what brand though :oops: Quote Link to comment Share on other sites More sharing options...
Ira Posted April 7, 2006 Report Share Posted April 7, 2006 The PAR is usually higher with lower kelvin too. And that's irrespective of the subjective color difference making one appear brighter. Quote Link to comment Share on other sites More sharing options...
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