The trick to wearables is not to have a UI. Everyone has a powerful computer with a great UI in their pocket. Wearables should leverage that by providing absolute minimal controls (no more than 1 or 2 buttons/knobs, no more than a small digital watch like display) and should transmit their data to the users phone via BLE. Then an app on the phone should provide more advanced control and display of results. The value of wearables is in providing additional sensors for apps, not in UI.

Correction, XPG2 is a 5W LED, not 5A. 1.5A drive.

"Marijuana plants like direct, intense sunlight. Unfortunately LEDs aren't very scalable. As you increase the current they start to run into physical limitations and the efficiency goes to hell. A 100W led may only put out 50lm/W, where a 1W led could put out 100lm/W."

I'm sorry, we've got plenty of LED systems out there pushing 2,000+ umol from several feet away, like any HID. And typical 100w LEDs are about 130 lumens per watt. Cree has LEDs available for the consumer that at 1w drive get 200+ lumens per watt (Cree MK-R) We figured out the Auger/watercooler effect and are working around it. We've got LEDs that dump 150+ lumens per watt at 5-10A drive current, now (Cree XPG2.)

"HIDs are actually extremely efficient (Around 100lm/W) and scalable (bulbs go up to 1kw+)."

We've got 1,000w LED packages in 70mm x 70mm size, with better efficiency.

" To get and equivalent amount of light out of LEDs with some sense of efficiency, you'd need thousands of them."

Plants care about photon flux, not lumens, which is weighted at green wavelengths for human vision. That's not saying that green light isn't useful in itself, but lumens mean jack shit when it's overall photon flux density making the real difference. I'm questioning how out of date your information is. Seems like way early 2000.

And thousands? Seriously?

http://tinyurl.com/mxq5w2b (PDF WARNING)

Try a couple hundred, easily fit on a 30mm x 30mm COB array board. Those are 5W LEDs each. The Cree MK-R is a 15W LED. 100 of those is 1.5kW.

" This may be suitable for plants that can deal with indirect sunlight, but it is not ideal for Cannabis."

http://i.imgur.com/5sCX9NX.jpg
http://i.imgur.com/KDI9NNX.jpg
http://i.imgur.com/cu2IsVO.jpg
http://i.imgur.com/0sJiDxs.jpg

Uhhhhhh..... what? Speaking as a medical cannabis user and grower, and as a landrace genetics preservation specialist for a Dutch seed bank, you're totally, absolutely, utterly wrong.

Let's take one of the crops I've done. Wheat fodder grass for animals. Using current traditional soil methods, one acre of fodder grass will require 100,000 gallons of water. Most of this water is lost via transpiration of the plant and evaporation from the soil.

I can build you a 1/8 acre building, load it up with recirculating vertical-stacked NFT channels, and you could produce that same acre of grass using 1,000 gallons of water.

http://www.youtube.com/watch?v... - have one of the UK projects I worked on.

If you consider a strip of metal barely rigid enough to support the strip a heat sink, sure.

I don't use heat sinks unless I'm dealing with insane power. Like 1,000w in a 70mm x 70mm package.

Well, as I've stated above, the problem is selling them. The kind of people who buy their cars aren't buying the arguments about electrics, it doesn't matter if they're right or wrong. They're the ones with the money.

If Mercedes became convinced tomorrow that they could sell more EVs than dino drinkers, that's the direction they'd head. If they can make balls-out concept EVs, then they can make an actual car.

I just (yesterday) found a module with a bright sticker that says PROTOTYPEN in the E-Box of my A8... egads!

But most of them in fact are in that situation. If you want to make no real sysadmin comments, I may well agree, but it doesn't change much.

Getting a PhD in Civil and Environmental Engineering, and I'm going to be a professor in British Columbia, work one semester a year, and travel around the world on consulting jobs to pay for airfare.

I don't actually have to work past 65, I should have plenty of money, but in my family we live a long time (100 or more years) and I'd be bored otherwise.

It's not for the health care, as a Canadian Citizen I get that when I get older, a lot cheaper than the US Medicare I also qualify for, but more contributing to the communities in the Kootenay region of BC that I grew up in. Should be fun!

Plus, lots of skiing and fishing. I'll probably only go on the double black diamond runs.

"And she's been unwilling to loan me a unit for test purposes, dammit ;) "

Your sister does my exact job.

What sort of unit are you looking for? I've got tons. General purpose, microgreens, hell I've got technology to grow some plants without any light at all (very useful for the cattle/sheep ranchers) with a 99% reduction in water requirements.

"If you've got evidence to show, please share....our electric bills will thank you"

Sure. http://ledgrowersforum.co.uk/

How about a cola as big around as my leg?

"LEDs aren't there yet. You can't get cannabis to flower properly under LED lighting, nor can you get the sort of growth rates you'll get under HID lights"

Yea, explain why I made it on High Times Pix of the Crop six years in a row using pure LED lighting.

Or how about you go roll over to http://ledgrowersforum.co.uk/ and learn how dead wrong you are.

"The parent post already stated HPS and LED lights have near the same efficiency..."

The parent post is wrong. Wikipedia is a horrible source for the rapidly-evolving world of semiconductor lighting. I've already got LEDs with 200+ l/w efficiency (Cree MK-R.) In single color LEDs, going to equal weighting and ignoring the weighting of green, you might as well just say 330+l/w, which is double any HID (excepting the almost pure-green low pressure sodium lamp, which can do 220+ l/w.)

"HPS is in the >100 lumen/watt ballpark"

Only in their more inefficient ranges like 250 and 400w. 600w can get up to 160l/w.

"LEDs, while capable of much more efficiency when operated at currents below their maximum ratings, usually operate near the same 100lm/W efficiencies when operated at maximum current"

Current LED tech is 130+ l/w and Cree's already popped 200+ at room temp 5600K 80mA drive with their MK-R, and in the lab, they've already hit 303+ at room temp 5150K color temp and 350mA drive.

" But a 400W LED fixture would produce nearly the same heat overall. It just wouldn't get as hot ;-) "

Comparing 400w HID to 400w LED, full power, the LED will produce on average 15-20% less heat, with that heat difference made up as light output.

"apparently you have no idea just how much heat LED arrays put out."

I design LED systems globally, son.

Try again when you know who you're talking to - THE LED expert on this site.

I don't find it to be ugly, it just looks like another car to me. If you compare it only to the insipid selection of blandmobiles that we get here in the USA, I suppose it looks a little fruity. However, it is definitely better kitted than a base econobox. You can get all the same features on your shitpile, but it will cost more than 10k.