MEASUREMENT AND INDICATION OF THE ILLUMINATIONS DURING PLANT EXPOSURE

In spite of the fast increasing use of artificial light in present-day horticulture under glass and the decades of plant irradiation research that have preceded it, many questions prove to remain unanswered on a closer examination of this technique.

An important aspect is the measurement of the illumination required for the comparison and interpretation of the results obtained.

In this paper the methods of measuring and indicating the illuminations generally employed are discussed, and the imperfections attached to them are pointed out.

An attempt has been made to indicate a method of measuring which, if it would come to be generally accepted, might bring some light into the confusion existing in this respect, and would considerably reduce the chance of errors.