Hey everyone, I’m growing three seedlings and want to know if my light could be a good LED light for growing at least one? Specs down below, please let me know!
Feit C4000/5K/LED 300W Replacement 5000K Non-Dimmable LED Light Bulb
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It seems as though this is a repeat of another post with the same corn light. I looked it up and actual watts are 38 so Yes this is a good light. You can get a “Y” socket and use two of them without any problems.
Oh I’m sorry, I saw your comment on the other post, but this question was more about the quality of the light and how well it could grow one plant! Sorry for the confusion @barry1
NO problem. Light is light. As long as it is in the color temperature range (which it is for veg) you’re golden.
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Thank you!!
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The only real issue will be, is it ENOUGH light. My guess is no. It would be good for starting your plants, but more light means more buds ultimately. If you want to stick with LED’S, the experts are saying to look at COB led’s as better quality. There are other choices too and there probably is no wrong choice. You will need to decide what’s best for you.
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I sold my twin 600 watt MH/HPS light setup and replaced them with twin 1200watt King plus LED lights
I’m growing 6 plants in a 4x4x8 room
https://www.amazon.com/dp/B01JLKUA2W/ref=asc_df_B01JLKUA2W5051290/?tag=hyprod-20&creative=395033&creativeASIN=B01JLKUA2W&linkCode=df0&hvadid=196266503207&hvpos=1o1&hvnetw=g&hvrand=184665509681521897&hvpone=&hvptwo=&hvqmt=&hvdev=m&hvdvcmdl=&hvlocint=&hvlocphy=9008950&hvtargid=pla-315184911311
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Ok, @professordank, first thing first… You wish to use this corn LED light in an outdoor home made greenhouse…
So let’s took a look at this light specificationsfirst , shall we…
It is 300 W equivalent good… only drawing 38 W, good… 4000 lumens,
good, good enough for seedling / sprouting.
For vegetative stage, you’ll need to, at least double it, so, you’ll need to buy another one and a “Y” socket like @barry1 said… if you can find a socket long enough to fit two corn LED light bulbs like this.
For flowering stage, you’ll need to buy 2 other corn LED light, but with a 2500K +/- 500…
That’s in the best setting for the best result… However, that kind of setting, if you’re not aquinted with a LED light bulb furnisher is gone a cost more than the suggestion made by @Myfriendis410 and @hillbilly103 …
I do not know your budget, but I suspect it is a tight one, so, here’s some budget friendly LED top of the line:
https://www.amazon.com/CF-Grow-Light-Full-Spectrum/dp/B06XFNXLBK/?tag=greenrel-20
Hoping that’s helping you @professordank, if you want more budget friendly LED light (much more), just tag me or other in this forum…
~Al 
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I was putting a lot of thinking into it today and I purchased the ‘VIPARSPECTRA Reflector-Series 300W LED Grow Light Full Spectrum for Indoor Plants Veg and Flower’. What is your opinion on that light? A lot of review have it being good! Let me know @Niala
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You could try building a reflector for the lamp. I think you’ll be way better off horizontally mounted with a reflector than anything else. You’ll want to get as much surface area of the diodes over the top of your plant, then try to find a way to reflect some of the light from the opposite side of the lamp. Do some Google searching for diy cfl reflector if you need some ideas.
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Return the viparspectras and get a roleadro 400w cob. Same price, vipar pulls 123w from wall, the cob 200watts. I’ve had both and the roleadro blows the vipar outta the water
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Has anyone put the roleadro cob’s on a kilowatt?
I ask because outside of wattage claims, the only technical data it lists is that the operating current is 600ma. For that 2 cob fixture to be 200 wall watts each cob would have to have fv over 160vdc. That would be about 100 watts per cob.
I suspect the cobs are about 100 watt max which would require them to run at 3a to get there. Assuming the fv is around 36 or 72v, these fixtures are probably running between 20-40 watts per cob. Nowhere near the advertised 200 watts.
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It’s a good investment @professordank… , at about 56% of réduction in Amazon.com, so, for about 86$US, it’s one of the best for your money…
However, like said @HornHead, a COB technology is a little more efficient… Espacelly if it have second generation CREE COB chips like the one I suggest…
The lumens are more important thing to consider and the PAR (Photosynthetically Active Radiance) or light penetration for a better understanding… The 2 are closely related… More lumens=more PAR…
You can easily test the claim of all compagny, chinese, US or whatever country the diodes are made, by measure the LUX and make the conversion to lumens (Here’s a link to make the conversion, take the reading at 1 foot or 30 cm with a LUX meter … Lux to lumens (lm) conversion calculator)
You’ll need at least 10,000 lumens with a full spectrum light, no matter the veg and bloom switch, (you can achieved that by only play with the height between the canopy and the light distance…)
So, I stick with my recommandation, since it blow out an outstanding 12 000 lumens…I did’nt test it, but, I put my confidence in the second generation of CREE CXB 3590 chip…
So, you have buy a good light… and you’ll be happy with it… However, all suggestions and all indoor lights gone a be a fire hazard if you don’t build a water tight greenhouse, and this is my only non-negotiable advise, this and keep in mind that a greenhouse need to have some air exchange…
Hoping that’s helping you professordank…
~Al
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I have the 200/400 watt roleandro cob. And all I can say is it seems to work great. Someday I will get a meter and measure it.
I can tell you it is nearly twice as bright as my generic 100/ 300 watt light.
Hard for me to justify the expense of a meter though.
My guess is that most of these light no matter the type or manufacturer all play a little fast and loose with the numbers.
Oh look I just bought a bag of my favorite chips and the bag is smaller and so are the serving sizes… Oh look they’re reduced calorie… Oh and measure a 2x4 lately? The last ones I bought from big box chain was closer to 1.5x 3, but I digress.
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Thanks @bob31!
I certainly wasn’t suggesting that they didn’t function well, and it’s good to hear that you are happy with your purchase. I agree with the advertising, especially when it comes to lights. I don’t know a lot about growing, but I’ve been involved with led technology for other lighting. There are plenty of manufacturers that will give you honest hard data, but they also typically come with a hefty price tag. I have a 300 watt light on my bench right now, and the driver alone is about the size of that entire roleadro fixture. That’s what led to me asking. I suspect that roleadro, galaxy, or whoever is advertising the light, simply put 200 watts down because each cob is indeed capable of producing 100 watts. Probably driven at max current of 3 amps. Since they claim they system is run at 600ma, the actual electrical consumption is probably about 20ish watts per cob. The big picture here is that you’re happy with it. However, if you were targeting a certain output per sq/ft you’re probably considerably short.
In the light @Niala linked, you see a little more honest advertising. They say the cxb3590 is capable of running at 100 watts (max current) but actual load is about 65 watts. Most likely fv of 36vdc driven at 2100ma. I also agree that this particular chip in the 3-4000k range is one of the best out there. The thing about cree chips is that you get a huge boost in efficiency when ran at low current. The standard is about 1400ma, with I think about a 10% increase in lumens per watt at 1050ma, and another 15% increase when dropped down to 700ma. It’s kind of a pay now/pay layer thing. It takes a lot more chips to reach 200 watts at 700ma than it does at 2100ma. The benefit however is more lumens per watt, better canopy coverage, and less heat. If you’re chasing watts per foot on a budget, the vero 29 gen 7 is a much better option. They don’t have as much efficiency drop at higher current as the cree cobs do. Another major benefit of the vero is that they’re about $15 cheaper with the holder built in. I think I have about $300 into my most recent build that pulls 310 watts from the wall using 4 cobs. Granted it took some assembly on my end, but way cheaper than similar commercially built lights.
I realize that the diy light isn’t for everyone. But I think a lot of you guys are pretty damn sharp! I’m sure you can handle it. If nothing else there are some kits available at pretty good prices too.
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Has anyone tinkered with these? I would be willing to bet you could get pretty solid results if you had a few of them, and removed the diffuser and reflector. If nothing else, probably great for some side lighting or to supplement during bloom.
The problem really comes down to if you don’t have a meter if you have to rely on what the companies advertise.
I’d love to learn to build my own lights. I’m reasonably confident in my skills. I built a few heath kits in the day hahaha
That’s the first I’ve seen of those spotlights. @dbrn32
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