Approximately 10% of patients report an allergy to penicillin. However, the majority of patients (greater than 90%) may not truly be allergic. Most people lose their penicillin allergy over time, even patients with a history of severe reaction such as anaphylaxis.
Additional lighting equipment is often necessary to compensate the low levels. Earlier it was common with light levels in the range 100 - 300 lux for normal activities. Today the light level is more common in the range 500 - 1000 lux-depending on activity.
The light intensity of artificial lights for home use is generally low in comparison to that of sunlight. Two Cool-White lamps will provide an intensity of about 400 foot-candles at foliage heights about one foot from the lamps. This intensity is minimal for the growth of most plants adaptable for indoor growth.