Articles Related to: HID
A Good Straightforward Guide To LED Grow Lights
e. 4. So any effective grow light has to allow for these various factors.
Pretty much every type of lighting technology ever developed has been tried for the purpose of growing plants. This covers conventional incandescent light bulbs, fluorescent tubes, the present market leaders which are high intensity discharge lamps (HIDs) including high pressure sodium (HPS) and metal halide (MH) lamps, and of course most recently LEDs.
Discounting regular incandescent and fluorescent lights, ... 
What You Need To Know About Energy Saving Light Bulbs
However, not all low energy or energy saving light bulbs are equal...
Discounting high intensity discharge lamps since these aren't really practical for most domestic lighting (HID lamps are commonly used for lighting large public spaces - sodium vapour streetlights are a common example) there are presently only three alternative technologies to conventional incandescent lighting that are considered to provide a viable domestic energy saving lighting ... 
