Re: [APD] LED Lighting

[Arild Madsen <Arild_Madsen at chello.no>]

Andy Lavery skrev:

> Hi all,
>
> I must say, I've truly enjoyed reading the archives of this list though 
> I didn't find specifically what I was looking for; So I joined so I 
> could ask a question.
>
> Has anyone tried to use LED lighting to light a planted tank? I've been 
> researching this for the last couple weeks - I can't find anyone who's 
> done it (Well, there might be some dutch/germans - but my knowledge of 
> those languages is lacking). But I've found plenty of LED moonlights in 
> fresh and saltwater aquaria.
>
> To test the theory, having an array of 6 luxeon star 470nm lights - I 
> put them on my 2g planted tank. The tank glowed well beyond what the 
> current 2 x 13w power compact could ever do. The fish definitely didn't 
> appreciate it... I hope that was just the intensity & color.
Do we know what wavelenght's the plants need to grow?
One LED wil only luminate at one wavelenght, which would bee a good 
thing i we knew the ideal wavelenght for the plants to grow.

> I'm going ahead and ordering 20 ultra bright white (6500Kelvin) 5watt, 
> 20 degree 10,000mcd LEDs, in order to truly test whether this could work.
White LED's are a hybrid tecnology between a LED and a fluorescent lamp 
and acording to what I have been told they will bee less efficient over 
time compared to ordinary LED's.(limited lifetime)

> Of course I've got doubts running through my mind, I have to wonder if 
> 25w of LED light is too much in comparison to the power compacts 
> currently on the tank. How best to space the LEDs to get good coverage 
> (I'm sure that will be trial an error - but the 20degree 'spotlight' 
> like output is going to make things difficult). I don't suppose of the 
> lighting guru's here - I might have some answers?
Godt nytt år / Happy new year.

Arild Madsen

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