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Surprise-surprise. What you choose is low power led. To have better efficiency, you need better led such as CREE XM-L wich will give you 90lm/watt. There even led that give you over 100lm/w but can't remember the model
I found at Sim Lim Tower there are LED light strip & Transformer kit available, wonder is it possible to modify an existing 36Wx2 PL light into LED.
Doing some comparison of the light output :
36W PL according to Philips spec is 2900 lumen, so 2x36W = 5800lm at 72W.
(80lm/W)
According to this website, a 1m long LED light strip (60 pcs of LED on the strip) give 204lm total.
http://www.superbrightleds.com/cgi-b...mpFlexible.htm
So to give the same amount of light flux, will need 5800/204=~28 LED strips (1m length each). At 10mm weight per strip, if assume edge to edge with no clearance, probably 1 ft width. So the physical area for mounting will be minimum 3ft x 1 ft.
And it will draw 260mA x 28 =~ 7.3A of current at 12V = 87.6W ??? (66lm/W ?) Am I calculate this right ?
On the other hand, some google search found this is quite promising :
http://www.current-usa.com/lighting/...ed-striplights
So there are some higher output LED strip out there....
Last edited by dc88; 13th May 2012 at 10:13.
Surprise-surprise
Shadow.. how does that CREE XM-L 90 lm/W compares with say T5 HO?
I thought T5 HO also produce the lumen/W in that region?
All fluerescent type of lighting will drop lumen after 6month to 1year, LED last longger.
LED produce more µMol•m²•sec compare to fluerescent, this is the one that plant see, not lumen
I see.. I look forward to the day when 6000-6500k LED are available.
Don't really like the bluish tint of the current LED in the high-end market.
I don't like it either, it will make my plant look pale. I normally add at least 1 tube of T5 just for color rendering. I was thinking to add couple of red and green LED, but too lazy to DIY
I think the higher color temp of the current LED may not be ideal for plant growth.. That's what I read and that's what I experienced. Not sure if you can mix and match to get the resultant color temp.
I see, Thanks !Originally Posted by Shadow
Surprise-surprise
Can suggest where to find this CREE XM-L ? Does it come in mounted strip ?
Using T5HO currently. The current market offering of LED color temp does not satisfy my requirement
I went to the website at your linked, the picture is using plastic plants. Do you dare to buy LED for planted tank from the company who can't even grow a real plant?
lol! didn't notice it at first.
looks liked the LED market is still developing. Not a lot of good reference data (on real planted tank environment) how are the lighting intensity benchmarks to current proven technology liked T5 or PL.
The old lingo of "wpg"will have to be re-calibrated...
Those who are interested in DIY can try SKU 48280 (30V 1A Current Source) + 9 pcs of SKU 2394 (Cree XR-E Q5) from Dealextreme. These should produce about 2000lm but again all plant care is PAR rather than lumen.
There are tools for measuring PAR.
The downside is, their quite costly.
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Can i buy a LED bulb in E14 connector and use it with a IKEA table lamp? Cause the scape im trying to do, is a cube tank with black oyama all round, some overlapping wood and thin sand bottom, with ketapang leaves to make the water slightly tinted. Planning to keep cories.
I already have a lamp stand with E14 connector. Saw this bulb on dealextreme, LED spot light. As i want to find a light that is a spotted beam rather than a broad beam.
doubt your wish will happen soon...
these white LED are actually blue LED with a yellow phosphor. the mixing of blue and yellow gives a perceived white light.
thomas liew
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Thomas.. perceived meaning what? as in... to human eyes and the plant sees something else?
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Actually, the led segment has been established already, just that ownership of such off the shelf lightset is still putting off would be owner due to the cost. Mis-information is still prevalent in the community too. Owner of led lightset has reportedly said that electricity consumption has lessen compared to using mh as led coupled with their lenses has more penetration power than mh but less heat load ( for marine tank ). User has to adjust their lightset in order not to shock their coral. With less heat exposure on the water, the chiller would be operating at a lesser run in frequency and water top up due to evaporation from the heat of the mh has lessen in volume.
However, led companies has continually to innovate to better their product. As of today, the 3w per led bulb is taken as the standard to have on your tank, coupled with the lenses. There are also 50w led bulb that has just started to be used as the main light source too. News of 5w per led bulb has surface on some boards. With higher led wattage comes lesser bulb usage on off the shelf lightset. All in all, we as the end user are going to benefit from this advancement.
Hope this helps!
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perceived by human eye.
although the blue light emission is much higher, is not perceived by the eye.
thomas liew
Cause the scape im trying to do, is a cube tank with black oyama all round, some overlapping wood and thin sand bottom, with ketapang leaves to make the water slightly tinted. Planning to keep cories.
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