Ask a Question forum: Cfl vs LED for grow light

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Maryland
Alexp08
Jun 29, 2017 4:39 PM CST
So I'm currently using artifical light for all my house plants. Currently I'm using 24w 1600lumen 6500k CFL bulbs. I've been trying to transition to more energy efficient leds. So I bought a 100w 7000lumen 6500k LED flood light. I tried to use it to replace 4 cfl bulbs.
But the light seemed much dimmer than the 4 cfl's which only have 6400 lumens compared to the 7000 lumens. It seems that the cfl's produced more filling light than the LED flood light.

So my question is, why is this? Did I just get a bum led light or is this how leds act in comparison to Cfl's?

Thanks
Name: Mac
Soon to be MidCoast, ME (Zone 6a)
Ex zones 4b, 8b, 9a, 9b
Cat Lover Birds Hummingbirder Butterflies Frogs and Toads Vermiculture
Critters Allowed Vegetable Grower Canning and food preservation Annuals Morning Glories Sedums
Image
McCannon
Jun 29, 2017 4:53 PM CST
If you're using an unknown light source to replace a known light source, always check the specs first.
The aboriginal people of the world and many other cultures share a common respect for nature and the universe, and all of the life that it holds. We should learn from them!
Maryland
Alexp08
Jun 29, 2017 4:55 PM CST
McCannon said:If you're using an unknown light source to replace a known light source, always check the specs first.


What do you mean? The led flood light was off eBay but it said 7000 lumens. Although I guess that could be wrong lol
Name: Mac
Soon to be MidCoast, ME (Zone 6a)
Ex zones 4b, 8b, 9a, 9b
Cat Lover Birds Hummingbirder Butterflies Frogs and Toads Vermiculture
Critters Allowed Vegetable Grower Canning and food preservation Annuals Morning Glories Sedums
Image
McCannon
Jun 29, 2017 5:02 PM CST
Without knowing the specs on the cfls or the LED, and the name of the manufacturer, I couldn't offer any opinion on the difference. Lots of factors to consider between 1 lamp and 4, regardless of specs. How are they positioned, are reflectors being used, lots of unknowns.
The aboriginal people of the world and many other cultures share a common respect for nature and the universe, and all of the life that it holds. We should learn from them!

volcanicclay
Jul 2, 2017 10:03 PM CST
Lumens are not the only concern. I assume you're using omnidirectional bulbs (so CFL or LED versions of "standard" bulbs, rather than floods)?

The other thing is that LEDs by their nature are directional. If you get an "omnidirectional" LED bulb built as a replacement for the "standard" incandescent shape, the cheaper ones just stick a plastic diffuser on top of a flat surface with the LED chips on it. This is "good enough" for some solutions but much more light comes out the end and not as much out the sides. Better built LED bulbs use all types of cool tricks with diffusers, LED placement etc, to get the light more even.

Also, some manufacturers do lie, and there are also counterfeits of good brands like Philips and whatnot.

Could you tell a little about your setup, that would help with some answers!
Name: Yardenman
Maryland (Zone 7a)
Image
Yardenman
Jul 3, 2017 12:58 AM CST
For now, I'm sticking with 5000 lumen fluorescent tubes. I think the LEDs are too uncertain for now regarding seedlings. On the other hand, my house is almost entirely LED now, so its not like I am against them. I just want to see better cost per sq ft seed growth data.

cu455
Jul 4, 2017 6:12 PM CST
It can be the spread. Flood lights are meant to cover a wide area so they have a reflector that accomplishes that. Lowering the lights will lessen the spread putting more light in a smaller area.

volcanicclay
Jul 24, 2017 2:55 PM CST
I actually got a 6500K LED "narrow flood" for use in controlling my sleep - I have issues which require me to max out my light exposure during the day if I'm not outside - but it was also an experiment to get a true idea of the spread, since I'm aiming it at the ceiling for ambient light. Turns out 25 degrees would be too small for my seedling area and I would need a 40 degree flood.

It is pretty hard to say what the issue is with OP's setup though because it seems they probably did switch from omnidirectional bulbs to a flood.

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