HPS vs. Induction + CFL flowering comparison

me too.

Quote:

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Originally Posted by emilya

lol... I need a bong hit after that one!

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Again with you?

Diamagnetism - Wikipedia, the free encyclopedia

You know cursory Google or Wiki searches can EASILY explain half of what I'm talking about, without making yourself look like a fool.

Quote:

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Originally Posted by khyberkitsune

Again with you?

Diamagnetism - Wikipedia, the free encyclopedia

You know cursory Google or Wiki searches can EASILY explain half of what I'm talking about, without making yourself look like a fool.

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My response to you is:
acyrologia - Wiktionary

Quote:

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Originally Posted by khyberkitsune

You know cursory Google or Wiki searches can EASILY explain half of what I'm talking about, without making yourself look like a fool.

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Dude, no need to be potentially or should I say possibly rude... (it's an inside joke).

Less than a week until harvest!

I decided not to modify the shade. Although I believe Bubba's advice would result in better yield, I felt it would not yield useful information to modify the cabinet in the middle of the grow. If this lamp is used in a future experiment, I will certainly make design changes based on his input.

The HPS clearly has more substantial flowers, and apparently more resin. I have used slightly larger pictures than before to try to show this off.

HPS Pictures
http://img823.imageshack.us/img823/5...sheight.th.jpghttp://img715.imageshack.us/img715/5...sflower.th.jpg

Induction Pictures
http://img403.imageshack.us/img403/4...dheight.th.jpghttp://img413.imageshack.us/img413/2...dflower.th.jpg

Quote:

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Originally Posted by vanduction

Hi, this week I will be starting a comparison grow between HPS and Induction lighting.

Question: Can induction lighting produce the same flowering performance as HPS lighting, while using 50% or less watts?

The goal is NOT any of:
- examine veg growth
- produce maximum yield
- try any other kind of experimentation

Methodology:

Manufacture 2 identical growing cabinets. The only difference is the lamps installed in each cabinet.

Put in each box an equal number of veg'd clones that are ready for flowering. Feed & water the plants the same during flowering.

At the end of flowering, compare the quality & yield of each cabinet.

The lights:

Cab 1) HPS with magnetic ballast.
- Rated power: 250w
- Actual power used: 315w

Cab 2) Chinese induction lamp
- Rated power: 120w
- Actual power used: 118w

Cab 2) 2 x Sunblaster 2' CFL
- Rated power: 24w
- Actual power used: 20w

*note: The CFLs may be added because my actual power use estimates were off (I expected the induction to consumer more than rated) and I wanted to get closer to 50%. Feedback on this decision is appreciated.

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Wow, I want to know the results of this. Thanks

I am very interested in this grow. I have been in contact with a Chinese supplier. I was quoted almost $ 300 for shipping a 400 watt lamp 2700k with the housing (36 kg monster lol) ! So I asked for a quote on just the ballast and the lamp w/o the housing. The shipping comes to $ 80.00. I have negotiated a reasonable price but am still pessimistic with the credibility of its performance. This grow could determine my decision to buy one so please keep us updated

Thank you :jointsmile:

Taken just before the plants were cut:

HPS:
http://img217.imageshack.us/img217/4...sflower.th.jpghttp://img38.imageshack.us/img38/199...hpsside.th.jpg

Induction:
http://img130.imageshack.us/img130/3...dflower.th.jpghttp://img831.imageshack.us/img831/3...indside.th.jpg

The final results are in!

Heights:

• HPS: grew about 14" above the soil. There was 22" of clearance to the lamp
• Ind: grew about 12" above the soil. There was 25" of clearance to the lamp

http://img829.imageshack.us/img829/7...hpsroom.th.jpghttp://img407.imageshack.us/img407/2...indroom.th.jpg

These clones can easily grow to 24"+ in this amount of time, so next experiment I will lower the lamps 8"-12" (depending on power used) to increase performance.

Yields:

The container used to weigh is 32 grams. All weights were done with freshly cut WET flowers:

http://img257.imageshack.us/img257/9...sweight.th.jpghttp://img718.imageshack.us/img718/5...dweight.th.jpg

• HPS: 195.9 - 32 = 163.9g
• Ind: 109.9 - 32 = 77.9g

Hey Van, I've been lurking here watching all the action...very interesting btw! Would you also post up the dry numbers when available? So what did you conclude? If the dry weights are comparable, looks like I'll keep running my HID's for awhile longer! Thanks a lot for taking the time do this and to post all this...I look forward to watching your next test, whatever it may be! :thumbsup: