are leds any good at growing

are leds any good for growing indoors?

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Answer from Stella/Simon:

Hi there anonymous,

There sure is a lot of hoopla regarding LED lights for hydroponics. Check any website selling supplies or stop by your local hydro shop. You are sure just find some LEDs for sale there.

But ask anyone experienced in hydroponics... listen in on a few hydroponics forums... LEDs just don't work, so don't buy them. We don't sell them or endorse them here on this website. Why not? They just have not been perfected, and do not support flowering and/or fruiting plants properly.

So my answer to your question is, it depends on what you are growing. If your focus is strictly on leafy green vegetables like lettuce or herbs, then they would probably be sufficient. but for any fruiting vegetables or flowering medicinal herbs, no go.

We'll keep an eye on this promising new lighting technology for you. But for now, stick with HID lighting, okay?

Hope this helps!

***Do you have any knowledge on this subject? Then please join in and leave your thoughts and suggestions below. Help and be helped in the Forums!

Comments for are leds any good at growing

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Jul 18, 2013
What ?
by: Anonymous

I have only grown with LED lighting. I use a Prosource 180 watt UFO and get excellent results not to mention the money i save on electric. Not sure how long ago this was posted but who ever says LED do not work for flowering is definatley not at all educated on them.

Dec 27, 2013
LED is OK
by: Dennis

There are many kinds of grow light on the market HPS, MH, LED, induction, plasma, you may confused on which one is the best?

First we should clear two concepts first

1. PAR (Photosynthesis Active Radiation)
As the name said, PAR by measured the effective spectrum for photosynthesis in the lamp. Some lamps with high lumen output, but the effective spectrum is less, for example lamp A :the 1000w HPS with lumen output 155000lm compare with lamp B: Philips 1000w master greenpower lamp with 139000lm, the test result showed lamp A has 9 times green light than lamp B, and the red and blue light are half of lamp B. If you want test report just leave your e-mail, I will send you.
So this is the first concept: with high PAR is good grow light. unit μmol/s/m²

2. Light compensation point and Light saturation point

Light compensation point - the point for plants start photosynthesis
Light saturation point - the point for plant reach the fast rate of photosynthesis, exceed this point is no helpful to increase the photosynthesis rate.

I list some plants below:

PLANTS Light compensation point Light saturation point Photosynthesis rate at Light saturation point
(μmol/s/m²,PAR ) (μmol/s/m²,PAR ) (CO2μmol/s/m²)

CUCUMBER 51 1421 21.3
TOMOTO 53.1 1985 24.2
PIMENTO 35 1719 19.2
EGGPLANT 51.1 1682 20.1
CAULIFLOWER 43 1095 17.3
CABBAGE 32 1324 20.3
RADISH 48 1461 24.1
CHIVES 29 1076 11.3
LETTUCE 29.5 857 17.3
SPINACH 45 889 13.2

use cucumber as example, when PAR exceed 51 μmol/s, it starts photosynthesis, so any lamps when light reach the surface of leaves still have more than 51 μmol/s, it works, reach 1421 it works better.

Of course PAR just measured effective spectrum, different plants need different spectrum in different grow stage, combo these effective spectrum as plants requirement will cause them grow best.

want to discuss with me , contact dennis@lumenhort.com

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