I used a Draper Light Meter and i know not the method of measurement as it does not quote and numbers do not tally up to Foot Candles or Lumens. Needless to say it is used primarily as a comparison of the difference in light output of the different bulbs.
Tested are both 16 Watt and 19 Watt LEDS and a 20 Watt Compact Flourescent and a 26 Watt Flourescent would not make a great deal of difference to the 20 Watt version.
REMEMBER UNDER STAIRS...NO DAYLIGHT!
6 to 8 inches from 16 Watt LED...
6 to 8 inches from 20 Watt Compact Flourescent Energy Saving Bulb, Sylvania.
60 to 8 inches away from 20 Watt Flourescent..
6 to 8 inches away from 26 Watt LED Toshiba E-Core...
6 to 8 inches away from 19.6 Watt Toshiba E-Core LED bulb, tips over maximum?!
Forgot camera flash was on for this one but makes no difference as you can see from other photos!
Now all lights WERE fluorescent previously but nowhere could I place the light meter and even reach half way on the meter scale...
But with the meter on the FLOOR under LEDs, around 18 inches, meter reads just over half way, around 400 to 500, whereas a fluorescent light set would be 150 to 180 at the same distance.
So for light loving Orchids I recommend a Toshiba E-Core Spotlight. Do not buy the 12 Watt Cree Spots as they seemed no brighter then the 9 watts while being double the size. I have 9 watt Cree bulbs and are OK but only received one ever of the 12 watt and it FAILED after two hours?!
At 2700k colours these are perfect for plants too as the red and blue frequencies I was told about is not quite correct.
ORANGE is the best light frequency, 2700K roughly. 4000K is white and above heads towards blue while below heads towards red.
BLUE is a secondary light frequency for plant growth and orange the primary. These Toshiba E-Core LEDs have certainly shown me that this IS THE CASE!!
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