BlackStar 100 watt LED Grow Light UV

I've been using 12 x 26 watt cfl's for my veg. I recently starting flowering and I wanted to upgrade my lights. I know MH/HPS run better but given I don't have proper ventillation, I went with LED.

The product is:
[h=5]BlackStar 100 watt LED Grow Light UV (2012)[/h]Specifications:
- Size: 7" Diameter
- Coverage Area: 1.5' x 1.5' (2 Square Feet)
- LED Chipset: 2W
- Number of LED's: 50
- Rated Hours: 50,000
- Bands: 6 Band
- Red: 630, 660nm
- Blue: 425nm
- Infrared: 730nm
- Ultraviolet: 380nm
- White: 12000k
- Worldwide Voltage: 90v-240v
- Modular Power Cord (Available in US, UK, EU, AU)
- Warranty: 1 Year All Inclusive

Now my growing area is a tall cabinet. I've included the specs from the cab in a picture. Here's my question... If one of these lights aren't enough, should I buy the same light and have 2 x 100 watters? I would love to keep my cfl and add the LED but no space to add CFL and LED. I could put in 2 of these led's though.

My last question is; is there a better recommendation for LED? I'm trying to limit my budget to $200 CAD or under. I would love the 240 blackstar but it's roughly 400 dollars...

The Blackstar 240W (flowering model) goes for under $300 shipped on Ebay.
Is the price $400 for you because of shipping to where live (outside of the states).
I don't believe that the Blackstar 100W will be enough light for a what's roughly a 1.5' x 2.5' grow area.
I think you'll be much happier with the results from the more powerful light, even if you have to spend a little more.
I've heard that if you call Gotham Hydro (makers of the Blackstar LED's) directly, they'll hook you up with a deal on the lights and shipping.
Good luck.

Returning the 100 for a 240 blackstar. I was also told to buy advance nutrients: rescue/ revive for led lights. Anyone have a good site for that?

Why would you need different nutrients for growing under LED?

I'm just repeating what the led guy said. Its to help damaged/ stressed plants heal or something. He said when using a the 240 led, use revive because certain strains don't work good with led. I guess the uv or something in the medium - high power lights love cal mag / revive. He said I can use my normal nutes but if I added the "revive" or calmag, it would help with the led...?I'm a cfl grower so I took his word for it. Weird thing was he wasn't trying to upsell more of his stores products but mention a different product so I thought it must be legit because why would someone mention others products. I think he was trying to help out. So back to my question sorry, do I need extra nutrients/ calmag/ revive for a medium led blackstar light in a cab?Is 240 overkill? And is the uv damage that bad? I'm currently using nutrients for veg a&b and soon switching to bloom stuff.

Hehe, did a search to see if I could find anything on the Revive thing, got this thread as one of the hits...

Xoshua said:

I'm just repeating what the led guy said. Its to help damaged/ stressed plants heal or something. He said when using a the 240 led, use revive because certain strains don't work good with led. I guess the uv or something in the medium - high power lights love cal mag / revive.
So back to my question sorry, do I need extra nutrients/ calmag/ revive for a medium led blackstar light in a cab?Is 240 overkill? And is the uv damage that bad? I'm currently using nutrients for veg a&b and soon switching to bloom stuff.

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With over 2 years of LED growing under my belt now, I can tell you for sure that certain strains don't respond as well to LED light as others.
I find that White strains (White Widow especially) have issues during flower with LED's.
I think it may have something to do with how the plant processes light and its nutrient intake.
Considering White Widow is bred from a mutant, it would make sense that it might have an unconventional nutrient processing technique compared to other strains.

Cal Mag is essential when growing with LED lights, especially if you're using reverse osmosis (RO) water.

The Blackstar 240W model only actually uses about 135W, so that definitely isn't overkill for the for space you have.
It's deceptive advertising on their part to call it a 240W, that's how many watts the light would use if the LED's were cranked up to full power.
You can not run LED's at full power and expect them to last very long though, so most companies run them around half power.
UV is not bad for plants, as long as it's in small amounts, it helps with resin production.

What issues do they have would you say? Need to keep this in mind since I am now an LED grower, might want to try some White strains some day.

brotherjericho said:

What issues do they have would you say? Need to keep this in mind since I am now an LED grower, might want to try some White strains some day.

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White Strains (White Widow especially) have yield, stretch, and nutrient issues under LED.
Not every single cross with some White in it does this, but the more Widow in the plant, the more likely it is to happen.
Right now I have Black Widow from Female Seeds that is being a huge pain in the ass.
She keeps stretching and stretching weeks after all the others in my flowering tent have stopped to start heavy budding.
And no, I'm not just mistakenly comparing a sativa against a bunch of indicas, there are other sativa dom plants in the flowering tent too.
I'm throwing more nutes at her then any other plant and she's going to have the smallest yield by far.
I also have a Sharksbreath going as well, but that one isn't giving me as many problems.
It is a nute hog, but it's not stretching out of control, the yield looks to be somewhat decent, but it does seem to be lagging behind the others a bit.
I grew out some White Rhino last year and that was very problematic, as I had a Widow leaning pheno, what a nightmare.

My one plant under the LED is a Female Seeds Neville's Haze. It is short for a sativa dom, but it had issues early in life. I have found though that this plant is much more resistant to light and heat than the indica doms I ended up killing (PLLs too close early in life). Do you think getting the white strains closer to the LED might help, or is it just a bad strain family for LED?

I think White Widow and most White crosses are just a bad fit for LED light.
For whatever reason they just don't respond that well to it.
I have not run across these problems with any other strains, even the ever picky Blueberry likes LED's.
For what it's worth, strains containing G13, Sour Diesel, or Purple (Eurkle) genetics have all done especially well in my garden.

Dang pirates hijacking my thread, lol joking. So on a serious note, I'm currently awaiting my blackstar 240. So if I use my current nutes for flowering (bloom stuff part a and b), do I need cal or mag for led to work? Other than my nutrients, do I require additional products or nutrients?

Xoshua said:

Dang pirates hijacking my thread, lol joking. So on a serious note, I'm currently awaiting my blackstar 240. So if I use my current nutes for flowering (bloom stuff part a and b), do I need cal or mag for led to work? Other than my nutrients, do I require additional products or nutrients?

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What will your growing medium be?

Grow mix : promix bx : mycorrhizae. Nutes: grow nutri+ crossance a & b and bloom nutri+ floraison a&b

You might need cal mag eventually anyway since Pro Mix is mostly just peat moss and perlite, unless your other nutes already have some calcium and magnesium in them. Not sure if Pro-Mix has lime in it, if so, might be enough cal and mag to get you along. If it does not have lime, 1 tbsp/gallon of soil is pretty standard and should be enough cal & mag for a whole grow.

Peat moss, perlite, verm, dolomite and calcitic limestone, mycho stuff too

Keep some CalMg on hand, you will need it Xoshua.
My apologies for any thread hijacking sir.

BTW Brotherjericho, placing the LED's closer to the plant does not solve any of the a fore mentioned White strain related problems.
I've tried it before without success, but forgot to mention it in my last post.

So for the blackstar 240 requires calmag?

Yes, you will need CalMg.
Every LED grow I've ever seen has needed it, including my own.

Interesting. I ordered a jug this morning since I am under LED. TY for the heads up. Do you think a calcium/magnesium deficiency could be the cause of my brown spots?

Thread: https://www.rollitup.org/marijuana-plant-problems/518554-rusty-brown-spots-leaves.html#post7255583

My plant needed to be watered this AM so I added a slight amount of some organic fert granules (top dressed), it has a fairly high Ca content (9%). Only added 1.5 tsps, using a 3 gal fabric pot. Also added a tsp of epsom salt for the mag. If there is a def of either two, this should hold it off until I can used cal-mag next time (I hope).