NORTH OF ENGLAND ORCHID SOCIETY, LIGHT READINGS
If your don't possess an accurate light meter, and wish to know exactly what amount of light your orchids are getting, here is a simple way using a camera ...
Free Orchid shows.
Every month we hold a free orchid show; either near Preston, Manchester or Warrington.
New members are always welcome, but our normal monthly shows are free to all, come along and take a look at your local orchid society.
See our orchid show page
The RHS Flower Show
July 19th to 23rd 2017
Come along and meet us in the Society Marquee, free helpful advice and orchid potting demonstrations; we can supply you with top quality approved orchid compost.
The Society once again taken a Gold Medal in last years event, along with the coveted trophy for Best display in the Marquee.
Our display in 2015 year created in association with the OSGB and took Gold, as well as the coveted Holford Medal for a slideshow of it please click here
Most orchid books, and instructions will give a recommendation on how many foot candles of light a plant requires, that's all very well if you possess a foot candles meter, however as the average home does not, here is a way to make the calculations using the light meter of an ordinary camera.
1. a camera with a built in light meter
2. a grey scale neutral test card, obtainable form most camera stores.
3. a calculator.
Set the camera to ASA (ISO) 100, and the shutter speed to 1/100th of a second.
Place the card in the position your orchid is to occupy and adjust the camera aperture until you get correct reading, and note the aperture required ( i.e. f 11)
The light falling on the card in foot candles can then be calculated by taking the f stop needed(11) and squaring it (121) and then multiply that answer by 11.5 which will give you 1391.5 ft. candles.
It is probably a good idea to do a few readings under different conditions to arrive at a comfortable solution, especially in the more northern or southern hemispheres.