AMAZONIAN Posted February 1, 2008 Report Share Posted February 1, 2008 Hi All. Check out the data available on these two sites and make your own decisions. :roll: www.luxeonstar.com www.lumileds.com/products/line www.surplustronics.co.nz/shop/product The third is another NZ option to check out. Quote Link to comment Share on other sites More sharing options...
je_suis_ketan Posted February 1, 2008 Report Share Posted February 1, 2008 Ah I see. Sorry. That sounds really expensive to me though. Surely they are a lot cheaper than that. :-? Quote Link to comment Share on other sites More sharing options...
je_suis_ketan Posted February 1, 2008 Report Share Posted February 1, 2008 It's crazy running into Unit's you've never used before. I worked at a company that delt with really high vacuum pressure systems. Anyway they used the unit Torr which I found odd, being use to talking in Pascals and Bar or even mm (water or Hg)! Then again, I don't know of any other units for light intensity. Haven't had to measure it before! Quote Link to comment Share on other sites More sharing options...
Ira Posted February 1, 2008 Report Share Posted February 1, 2008 Any units for light intensity other than what? Than watts? The way that's normally used isn't a measure of light intensity. Quote Link to comment Share on other sites More sharing options...
je_suis_ketan Posted February 1, 2008 Report Share Posted February 1, 2008 Any units for light intensity other than what? Than watts? The way that's normally used isn't a measure of light intensity. I don't know, never had to measure light intensity. :lol: That's why I was a bit confused about it. The only time I've encountered light intensity as a measurement is when buying a torch and they rate it in candles! But I recently was told that 1 Lumen = 1 Candle. Quote Link to comment Share on other sites More sharing options...
Ianab Posted February 1, 2008 Report Share Posted February 1, 2008 You have found the reason that LEDs aren't used for everyday bright lighting - yet. As far as efficiency goes - it's something like this. Incandescant Lamp - 10 lumen/watt - 1,000 hour life Flouro lamp - 65-90 l/w - 7,000 hrs Metal Halide - 70-90 l/w - 12,000 hrs LED - 20-60 l/w - 50,000 hrs So you can see that LEDs are getting up there with the Flouro lamps for efficiency, but thats only for the flash EXPENSIVE ones, like the Luxeons. The normal cheap white LEDs work fine, but they dont have the high efficiency that the flouros do. Building a LED array that would replace a metal halide or a bank of flouros would indeed cost thousands of $$$ Cheers Ian Quote Link to comment Share on other sites More sharing options...
Warren Posted February 1, 2008 Report Share Posted February 1, 2008 And generate just as much or more heat for the same intensity based off the above figures. Quote Link to comment Share on other sites More sharing options...
Cricketman Posted February 2, 2008 Report Share Posted February 2, 2008 i thought light intensity was in lumens or lux, but that might be my mind making things up for me to believe.... :-? Quote Link to comment Share on other sites More sharing options...
Ira Posted February 2, 2008 Report Share Posted February 2, 2008 It is, which is why lumens has been used several times to describe the light intensity. And then lumens/watt for efficiency. Quote Link to comment Share on other sites More sharing options...
Ianab Posted February 2, 2008 Report Share Posted February 2, 2008 i thought light intensity was in lumens or lux Thats correct. Lumens measures how much light a lamp produces, while lux measures the actual amount of light illuminating any specific place. So the closer you are to a lamp the more lux you will have, even though the lumens from the lamp are the same. Cheers Ian Quote Link to comment Share on other sites More sharing options...
Cricketman Posted February 2, 2008 Report Share Posted February 2, 2008 cheers ian& ira, i did know that once apon a time, but i couldnt remember teh relationship offhand... hence the lux meter they use to test the light on the cricket pitch... Quote Link to comment Share on other sites More sharing options...
richms Posted February 2, 2008 Report Share Posted February 2, 2008 Also the "high brightness" leds are typically higher in the candella rating (normally done in thousands of millicandellas to help the ignorant americans with their SI units problems) is that they are just more focused whereas the lumen output is all the light made by the led no matter where it is directed. There are much cheaper sources for bare luxon and equivilants - deal extreme are ok for small quantities, if your getting more then 100 then the sellers on ebay are sometimes able to swing a deal. A mate ordered 500 RGB 5mm leds for about US$80 which would have being several 1000 locally at the likes of jaycar or surplustronics. Heaps of toys here for anyone looking at playing with leds - http://www.dealextreme.com/products.dx/category.917 Quote Link to comment Share on other sites More sharing options...
Rockerpeller Posted February 3, 2008 Report Share Posted February 3, 2008 There are much cheaper sources for bare luxon and equivilants - deal extreme are ok for small quantities, if your getting more then 100 then the sellers on ebay are sometimes able to swing a deal. A mate ordered 500 RGB 5mm leds for about US$80 which would have being several 1000 locally at the likes of jaycar or surplustronics. Heaps of toys here for anyone looking at playing with leds - http://www.dealextreme.com/products.dx/category.917 lol i was gonna post that site the other night! good searching tho. Quote Link to comment Share on other sites More sharing options...
richms Posted February 3, 2008 Report Share Posted February 3, 2008 I dont know of any others that sell hobiest stuff, most of the china/hong kong eshops just sell the mp4 players and cool cellphones and not the cheap stuff. If you know of any others like dealextreme I would love to know of them Quote Link to comment Share on other sites More sharing options...
Ant N Posted February 6, 2008 Report Share Posted February 6, 2008 How would LED strip lighting go for unplanted african tank (700mm deep) Quote Link to comment Share on other sites More sharing options...
Lani Posted February 13, 2008 Report Share Posted February 13, 2008 what's the relationship between bright daylight, eg 6500 kelvin in an energy saving bulb and lumens and lux? Quote Link to comment Share on other sites More sharing options...
evilknieval69 Posted February 13, 2008 Report Share Posted February 13, 2008 what's the relationship between bright daylight, eg 6500 kelvin in an energy saving bulb and lumens and lux? Kelvin and lumens have no relation at all (IIRC) Quote Link to comment Share on other sites More sharing options...
Lani Posted February 13, 2008 Report Share Posted February 13, 2008 thanks evilknieval69. I recall when I was looking for lighting that plants needed bright daylight, ie 6500K, if I find the site I will post it. Quote Link to comment Share on other sites More sharing options...
Lani Posted February 13, 2008 Report Share Posted February 13, 2008 http://www.peteducation.com/article.cfm ... cleid=2689 Quote Link to comment Share on other sites More sharing options...
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