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I may be misunderstanding here, apologies if so. The problem is with the manufacturers of the light units themselves not the led industry as a whole. Led chips are produced in batches known as bins, the specs for a led are documented in detail and the bin number will get you the specs. This is...

Are the multilux controllable or just on/off? Replacing burnt out smd leds is doable but not the most straightforward process. Assuming they're not potted they can be removed by heating the board just enough to melt the solder holding the led and pulling it off with a pair of tweezers. At this...

Honestly no idea. It's something I'd like to be able to sit down with a par meter and play till I was happy with the what I was seeing but as I have neither a par meter nor the time it's not something I'm going to nut out any time soon.

http://www.ukmarinelighting.co.uk/evergrow-d2120-timer-marine-aquarium-dimmable-led-unit-208-p.asp This is an evergrow unit, it's deemed suitable for up to a 36x18inch marine tank. I'm not sure how up you are with the expectations of reef keepers regarding par but most seem to shoot for 200um+...

Hit the proverbial nail so to speak, the problem with led units is not getting the par but spreading it over the tank often requiring multiple units running at a lower output to give you the desired coverage. Not really so different from using halides. Unfortunately for us no one has sat down...

I've no doubt it would be good enough but you'd need 3 to give you the coverage and I bet they cost a bomb.

Already done http://www.ukaps.org/forum/index.php?threads/30941/ It won't out perform triple t5s. Tbh I'm not sure it even matches a single but they certainly have no issues growing plants.

I'd go with the twin tube unit. 4 will be waaaaaay to much light for normal use but if you can switch it to 2 tubes then having 4 could be good for providing extra light for photos but otherwise pointless imo

If it's a 120x45x45 I'd go with 2 even for a low tech when I bought mine I sat it over my 120 just for some pictures and It was less light than 1x t5ho according to my camera.

Sounds like a good un then :cool:

That's cool just make sure it's got dual switches then(:

Nope. I'd go for a 2 bulb unit rather than a 4 though

From the Optimum Aquarium by Kaspar Horst and Horst E. Kipper (referring to readings taken is Sri Lanka) "The difference in lux was between fifty and ninety thousand lux" Unfortunately they don't state the time of day they took the readings so the shaded areas receiving only 50 lux may have...

I was going to hang mine and couldn't find an off the shelf kit. So I ended up grinding some light weight no6 nuts to slide into the slot, then all you need is the right length screws to suit

They just get longer Sanj the led density doesn't change I have a 60 and one of the guys at work has the 90 and I compared them side by side and there was no difference in the size or distance between the leds it's just longer.

Don't know what the aquarays are like but yes the arcadias do provide a good shimmer

It cost me £20 for glass cut to fit my 120x45 and a couple of pounds for a strip of polished stainless that I used to fold up ada style lid holder's

I'm using an arcadia classica stretch and no complaints so far. If you hunt around I think they're the cheapest branded unit. How big is your tank?

Not at all!!! T5s are a lot cheaper than leds and grow plants just fine, too many people use wayyy to much light anyway (some of the high power units need to be dimmed as much as 70%!). The only advantage as you've stated is power consumption and if you get a more expensive unit dimming control

Low tech, occasional ferts and soil substrate

Here's my tank at the moment

I have the 60cm over a 60x35x32 and it's plenty (well for crypts and mosses anyway)

According to my camera Stretch 1/8sec @f7.1 iso 800 1x T5 1/13sec @f7.1 iso 800 So not just dimmer to the eye.

Arcadia CS60F, mini review. | UK Aquatic Plant Society There it goes

Based on my observations Id say 1 is not quite as bright as 1 t5. I did a review (cant link from my phone but it is in the lighting section) and it has pics of it vs t5

I agree with sanj should be fine Im using the 60 over a 60x38x35 if its a touch bright then just add some floating plants.

It is very thin and water proof so I suppose you could use it under I just assumed your lid was clear.

Aracdia stretch led? It wont go under the perspex but would sit nicely on top.

Arcadia Stretch LED Dual Timer Installation | UK Aquatic Plant Society and a way of putting the moonlight and main light on separate timers.

2 should be good. You could go 3 if you're feeling brave these aren't dimmable. This a quick review of the 60 Arcadia CS60F, mini review. | UK Aquatic Plant Society The second last pic is the unit over one end of my 120x45x45.

Youre correct about spectrum and with a par meter youre leaps ahead just keep lifting the unit till the par is low enough and I dont think the optics will matter at that point because your unit will more than likely be high enough to give good coverage.

Have you seen the arcadia stretch led? If you shop around you would be able to pick up 2 of the cs90f units and still have change. Im using the 60cm unit and am very happy with it and I find its colour rendition very good as it uses a blend of different colour temp leds and the greens look good...

I've got the 60 Arcadia CS60F, mini review. | UK Aquatic Plant Society and this Arcadia Stretch LED Dual Timer Installation | UK Aquatic Plant Society should work on all sizes

Ideally yes. I'm a bit unsure as to whether the cheap ones are up to the job, have a look for the new tmc aqua bar or an arcadia stretch led 50 or 60

Plants use LED light just fine. I think that unit wouldn't be suitable for your tank as its too short. and wouldn't give enough spread. I used 2x 3w(single cree chip) gu10 fitting bulbs over a 60x35x35 for a while and they seemed to work well but if I did the same setup again Id use 3 bulbs not 2.

Hi and welcome. What sort of budget do you have? and are you wanting something that you can suspend or sit on the tank?

What unit does it use for PAR? if its micromoles (um) then that is Klingon levels of lighting I believe high to very high is around 100um at the substrate

They look like they're designed to have the end of the cable pushed into them and then the bit on the bottom is tightened which clamps it. As for where to buy? Would probably have to be custom made unless you can find something you could adapt

I put 2x t5s into my bow front 180. I removed the exsiting tubes and holders pulgged the holes and bought a hagen glo 2x t5 like this Hagen GLO 39W T5 Twin Electronic Lighting Controller Starter Unit - Complete Aquatics and used the mounts that came with it to screw it onto the exsisting bar.

Arcadia Stretch LED Dual Timer Installation | UK Aquatic Plant Society Done:)

I pulled mine to bits and added dual timers:cool:. Ill do a how to in the diy section if anyone is interested.

No just two on/off switches one for the moon light and one for the main light.

My review Arcadia CS60F, mini review. | UK Aquatic Plant Society and the light in its current home

The leds are the same and spaced the same so the par in a given area under the lamp should be the same.

I think the par is the same just longer if that makes sense

The Aqua Essentials website has a par x distance thingy on the product page

I did a review of the 60cm its in the lighting section somewhere.

It will be 1600 lumens and probably the date of manufacture march 2012

Not sure on that one but I have just bought an arcadia cs60f for 2 pounds more and it seems like a good unit. Ive posted a review in the lighting section cannt link from my phone sorry

Have a google for them this size unit has an msrp of £70 but I picked it up for £56 with free shipping

Hi All, A quick review of the Arcadia CS60F LED luminaire. As I don't have the new tank this is going on yet I have just popped it over my current tank for a quick functional test and some pics. I'll update this once It is in its proper home. The unit End view which shows the slot for hanging...

Nearly £200 for the 60cm :eek:

It seems not. I've ordered one, I'll let you know what I think when it turns up.

I think that only applies to the more powerful chips and would also depend on the optics applied to the chip. I've decided to get the arcadia unit as it has the slot in the top for hanging it. It needs to be bolted to the shelf above it.

Cheers Kirk, I thought it would be too good to be true. Ive used 2 gu10 fittings with 3w led bulbs over a similar foot print but they were 12ins above the tank so gave reasonable spread. I dont have the room to replicate this setup where the tank is going this time. Any thoughts on the...

Hi All, I'm after a suitable Led for a new shrimp tank with the dimensions of 610x320x350 my main concern is that as I want a low tech that off the shelf units like this may be to bright. http://www.aquaessentials.co.uk/classica-stretch-50cm-freshwater-p-6758.html The other issue I have is that...

I'm in agreeance with what you said (sorry if it didn't come across that way). I think we need to know where a fish comes from so we can decide wether it will be suitable to add to our setup. You wouldn't keep apistos with malawis or white clouds with discus for example. But at the same time you...

I think we still need to pay attention to the nature of the fish we keep. 90% of fish in the hobby will live full lives but not necessarily breed in neutral water and this gives us the option to keep a wide range of fish. I think alot of fish will live longer and be healthier in a high tech...

Nothing about keeping fish in a glass box is natural. We can never match mother nature. Take a fish that lives in streams or rivers in the wild it would encounter flow rates measured in cubic meters per second all fresh water, not the litres per hour of the same water we have in our tanks. Even...

Re: Help with my new led lighting Tbh I think that was max radius for those bulbs stuff was growing but only just in the very corners. I think 1 per square foot would be ideal.

Re: Help with my new led lighting Hi Alastair, Here is a couple of pics from one of my old setups I used 2x3w gu10s mounted 12" above the setup. The bulbs were a single 3w chip not sure on the optics 30 deg maybe? The tank is 60x35x35cm. You can just see the rig in this one, pretty crude...

Found it :geek: post 39 pg4 http://www.barrreport.com/showthread.php/4265-Light-Intensity-in-an-aquarium/page4?highlight=mylar

Just paint the inside of the lid white simple and cheap. I remember seeing a thread over on the barr report about testing differnt reflector mediums. If I recall correctly the op used t5s and tested mirror finsh mylar, tinfoil, white paper and a few others and tinfoil gave the best boost to the...

Hi All, After seeing quite a few threads asking for help with LEDs I thought I'd share my experiences with them. Not all LEDs are created eaqually so buyer beware What to look for when buying? -Chip manufacturer: Cree are the best but any branded bulb phillips,orsam etc should be using decent...

The GU10 bulbs seem to work well My rig, cost me about £13 incl bulbs (single 3w LED). Although I'm looking at getting something like this as it is a bit prettier and will give me a 3rd bulb...

Cheers It will look alot nicer once it stops being a holding tank and I plant it properly and make a permanent lighting rig out of copper pipe.

(Please ignore the fish this is a holding tank at the mo) Surface is covered appox 50% with some bioballs and floating plants

Hi Joe The one in the last link looks pretty good. Im going to use x2 3w gu10 fitting leds over my 60x35x35 low tech tank. I can post a pic of my rig as it is at the moment if you would like. I hope this helps