Parabolic reflectors hold high intensity discharge lamps vertically. The light element runs much of the length of the lamp. The light is emitted horizontally. If the reflector is as deep as the lamp’s length, it deflects the light and redirects it down, towards the garden, rather than spreading horizontally.
Horizontal reflectors hold the lamp horizontally. Much more of the light shines on the garden without a reflector and the rest is directed down. In several tests, horizontal reflectors outperformed verticals by wide margins.
Horizontal reflectors have other advantages. They are smaller and many models are air-cooled ready.
Readers with grow questions (or answers) should send them to Ed at: Ask Ed, PMB 147, 530 Divisadero St., San Francisco, California 94117, USA
You can also email Ed at [email protected], and send queries via his website at www.quicktrading.com.
All featured questions will be rewarded with a copy of Ed’s The Big Book of Buds from Quick Trading.
Sorry, Ed cannot send personal replies to your questions.