High Pressure Sodium - HPS
High pressure sodium bulbs emit an orange-red glow. This band of light triggers hormones in plants to increase flowering/budding in plants. They are the best grow lights available for secondary or supplemental lighting (used in conjunction with natural sunlight). This is ideal for greenhouse growing applications.

Not only is this a great flowering light, it has two features that make it a more economical choice. Their average lifespan is twice that of metal halides, but after 18,000 hours of use, they will start to draw more electricity than their rated watts while gradually producing less light. HPS bulbs are very efficient. They produce up to 140 lumens per watt. Their disadvantage is they are deficient in the blue spectrum. If a gardener were to start a young plant under a HPS bulb, she/he would see impressive vertical growth. In fact, probably too impressive. Most plants would grow up thin and lanky and in no time you will have to prune your plant back before it grows into the light fixture. The exception to this is using HPS grow lights in a greenhouse or in conjunction another light source that emits light in the blue spectrum. Light sources that have a high output in the blue spectrum like sunlight and MH grow lights offset any stretching caused by HPS bulbs.
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Fluorescent Plant Grow Lights

Until recently, fluorescent grow lights have had a low output and have been too big and bulky to be of much use as a grow light for anything more than starting seedlings. CFL and T5 full spectrum fluorescent lights have changed that. At 75 to 90 lumens per watt, these lights are energy efficient and extremely effective especially when used in numbers. Fluorescent grow lights also have better color rendering properties (more of the light emitted is used by the plant) and produce much less heat than incandescent and HID grow lights. This allows them to be placed closer to plants (within a few inches) greatly decreasing lumen loss from the bulb to the plant. It is recommended that these lights be placed no more than a couple feet from the plants for best results.
View (CFL) compact fluorescent grow lights, View T5 fluorescent tube grow lights

The standard T12 bulbs full spectrum tubes are fine for starts and seedlings and are popular for growing low-light plants like herbs and African violets. These lights are inefficient and are be replaced with high efficiency T5 lights which are a better light source for flowering and budding applications as well.
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LED Plant Grow Lights

LED grow lights are the newest lighting option for plants. They have come a long ways from the days of blue and red bulbs and are now available in full spectrum natural looking lights that blend in with the surroundings. LED lights are also among the most efficient and coolest running grow lights available. The LED grow bulbs we offer are completely compatible with T5 HO fluorescent fixtures. We offer them as replacement bulbs to upgrade your existing fixture, or as a complete system. They perform as well as the full spectrum T5 lights we offer while using less electricity and last over twice as long.
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Incandescent Plant Grow Lights

These lights are the most inexpensive to purchase but are also the most inefficient and a poor source of light for plants. At best they can provide supplemental light to individual house plants. Incandescent lights have a low lumen output per watt compared to HID and fluorescent grow lights. New smaller LED grow lights like our 40 watt Green Thumb system produce as much light as a 200 watt incandescent bulb, and more of the light is used by the plant. This type of bulb will pay for itself in energy savings the first 60 days of use.