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don`t forget that we increase longlife of the leds aswell if we double² the number of led chips. Longlife is really hard to measure, but i`m shure that a led, that run @ 10% of max. current is able to survive some of u growers. Prices for electricity are rising - and if you calculate the KWh of...

what kind of radiometric system do you use ?

2 more beers and you even do not believe in gas monkeys - and if you realize that you stoped to believe in the lord of the light... he wants you to puk out your marbling beefsteak. :spew:(:

if you could buy a CXB3590 for US$ 4,50 - your typical current range would decrease drastically. all i say is: that a lower luminous efficiency of a led can be compensed by the quantity of led chips. so if prices of cheap chinise led brands are only a 10% of a quality product like Cree - it`s...

10% ? 200-100mA ??? mucho bla bla - no proof ! I was talking about half current 3600/1800; 3200/1600; 2800/1400mA why can`t you (& cobkit) just read the datasheet of CREE ? we talked about low voltage consistancy only 4 months ago. Now you seem to be affected by Alzheimer or too much...

25sqf sounds like a 800-1000W led-lamp among the 1001 possibilities there is one I can recommend. watercooled led light - with integrated heatexchanger. - if you grow in your house - you could prepare ~ 250L of hot water every day. - my light-heat-cogeneration is world champion in energy...

if you read the datasheet(s) of one of the led chips you sell in your shop you can know that eg. CREE CXB3590 pretend other values. current (mA) // lm/w 1400 // 172,1 1600 // 167,4 1800 // 162,3...

may be till now nobody told you, that driving a led @ half current will increase light efficiency about 10-20%. i buy in asia 10 x 400pcs/smd5730led board for US$ 100,- duty + ship. incl. these epistar/epiled chips are rated only120LM/W @ 0,5W (Vf =3,3V / If=150mA) if you would drive 2 of...

if your grow room is close to the place where you live - try it with light-heat-cogeneration. as heat production of led chips is still 60-80% of the inverted electric. energy - you can harvest this energy with a heatexchanger and triple ***energy-efficiency*** The extra cost of the heat...

:peace: Welcome Sir - my name is captain Noah - and I want to change the crew of my boat. (: (Captain Noah and the five leaders of the continents 2011)

learning by doing - when i first tried to close an aluminium square tube i also used plastic end caps and tried out different sealing materials. finally i had to recognize, that a professional always would try it with a bolted flange + rubber seal. In theory i could fix 20-30 pcs of 100W led...

in the moment i use an electric boiler with integrated heat exchanger (80L, € 165,-) I never use the plug to heat up the water - with ~ 300W watercooled led light during ~15h (4,5 KWh) i can prepare my daily need of ~80L / 2 pers. With a closed loup and 3W aquarium pump (200L/h, 0,3bar) so i...

just wanted to convince him that he too can become world champion in cooling and energy efficiency with lowest costs for the heatsink/watt + a little bit of work

:peace: Ok. - with watercooled led light and light-heat-cogeneration it`s possible to recover ~60% of the inverted electr. watts as hot water - to use it in a builings`energy management or whereever. So in combination with heatexchanger, pv-panels or wind energy it`s not only a very good...

:peace: no - sorry sir :eyesmoke: --- of course there is a direct path --- as you know from a picture, posted last year. without drilling a "door" for the heat - Tj of any chip is much higher, due to the higher thermal resistance of the thermal grease or glue and the thickness of your metal tube.

any led lamp > 300W is worth to be watercooled - and can heat up a water boiler .

i think the best option to trigger wavelenghts > 660nm is a full spectrum of < 1800K pinkish white made by red phosphor leds

hello random nice to meet you in my neighborhood... you mean something like to forbid incandescent bulbs in EU ? i`m shure in Eu - parlament they know nothing about watercooled led light. so my strategy is more a basic movement of citizens, that are able to recognize the advantages described...

it might be of interest to know what they want - before... ... is a mighty tool to triple the energy efficacy of a led lamp build. So any watercooled led lamp (not only mine) are olympic *****world*****champions in this discipline - and my watercooled lamps are made for to execute fosile...

It`s cheap and easy to wire 100 cobs... if you are able then to increase light efficiency let`s say about 40% (100LM ---> 140LM) Driving a 200W lamp with 100LM/W ~15h a day cost you 1095KWh / year To produce the same amount of light with a 140LM/W lamp you need only 142W lamp fixture, that...