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My memory may be letting me down here but GU10 suggests mains voltage which, if I'm correct, is undesirable near water. If you can set them up in a safe way or use low-voltage equivalents then I'm slowly getting the impression the LED lights are on the cusp of some feedback around and about...

Thanks, Guys. In the past I have replaced bulbs due to age and it's what I was about to do now. However, in the past I've not noticed any discernable difference in growth etc which I why I began to think more about it.

Seriously - no opinions, proven facts, etc? Is it the case that nobody knows, or is there such a degree of uncertainty that nobody is prepared to stick their neck out? It's fairly obvious that I'm unsure about the true effect on plant growth, hence the post. Maybe it's just a boring subject -...

Are people still fully signed up to the concept of changing tubes every year (or whatever)? I'm familiar with the theory of the light output dropping over time and note some mention of the spectrum changing. I also realise that the drop in output may not be discernible because it's not...

Cheers, George. That's exactly the sort of information I was after. I suspect the Triplus and PowerGlo may be too harsh, which is a shame because I can get the Grolux from Lampspecs all for one P&P. Pondering...

Hmmm... having established that Lampspecs to not stock much in the way of 25w T8's I'm back trying to establish what bulbs look like so I can place an order online. From James' thread I like: - the the Phillips Pro 965 + Grolux - and also the Osram 880 Skywhite + Grolux combos. I'm hoping...

:( 25watt T8 range is very limited... Look.

I'm gonna replace the two tubes on my tank with a daylight and something suited to plants - in particular reaching the depths of my rather deep tank. What are people liking these days in the way of brands and tubes? Cheers

Thank you for such a comprehensive explanation - makes a lot of sense. Since my original post I've installed a £1.73 PL from my local electrical distributor. It was a little yellow to start off with but seems to have cleaned up to what I hope will be pleasing once the tank has substrate...

I was thinking that so much blue at the expense of other colours in the spectrum may not be esp good (as opposed to blue being bad). Can you have too much blue - so much so some is wasted? I don't really understand the science so forgive my ignorance. Thanks for the links, Baron.

Mu Aqua 40 came with a white/blue PL-11watt tube. I'm not overly keen on the blue light and I suspect it's not esp good for plant growth. However... I cannot seem to find anywhere selling alternatives. Anyone know of anywhere?

Absolutely no way I'd spend that sorta money on tank lighting. :D

Who would like a piece of this action for approx £120: You can specify 30 minutes for sunrise too as a £5 option.

If it's anything like the Rena tank I have you should be able to buy another slidy Rena unit and slide it in to the same slides as the current unit.

Well the plants certainly seem to be liking the Arcadia Freshwater tubes - pearling live never before! I haven't even changed the 3rd tube - it's still the old Aqua-Glo (at least until I settle on a suitable replacement). Thanks for the recommendations.

Juwel is Juwel... Hagen is Hagen & Fluval (and prolly some others too).

Brilliant! Exactly what's needed to understand the differing light options without spending a fortune buying different lamps etc. Thank you - I'm particularly grateful for the opportunity to see the Arcadia Freshwater (altho I accept your notes about images). FWIW you can see the effect of...

Definitely don't want a pink tank! Thanks for the tip-off. What are you currently using?

I have the following 3 tubes currently, all due to be replaced at the beginning of October: Front: Hagen Sun-Glo (Full daylight/white) Middle: Hagen Aqua-Glo (general purpose IMO, despite the suggestion that it "promotes plant growth" (which of course it does - it is a light source)). Back: Zoo...