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What is the white string at the bottom made of please?

Also I think my violets are a little to far down the scale at 405-415nm mabye too UV, your test with 422.5nm may have totally different results. Algae did grow it just looks stronger,thicker and...

It was a brand new screen an scrubber. I only used the violets as I had them kicking around (I got the violets to make a light for the main tank but never got round to using them) and I could only...

I took my screens out today and the side with the violet and red LEDs had much less growth than the side with blue and red in during my 2 week trial so the violets are coming out as soon my new red...

This is a view of mine, two red 625-630nm on the outside and one violet 405-415nm in the middle. In the flesh the eye sees the middle Led as very dull almost as if its not working properly but when I...

I've just finished my scrubber last week and I'm using violet and red LEDs. It's only been running a week and has started to grow algae but I'm thinking now I should have gone with 455 blue insted,...

Whats your opinion on using violet 405-415nm instead of blue 455nm leds?