When it's time for a replacement bulb, it is critical to buy the right one for your light system. HID (High Intensity Discharge) bulbs must match the type and wattage of your ballast exactly. For example, a metal halide ballast will not run a high pressure sodium (HPS) bulb, and a 400 watt ballast will not run a 1000 watt bulb. The exception to this rule are special conversion bulbs which are designed to run off one type of ballast but provide the other type of light. These are described in more detail below. Replace metal halide bulbs and high pressure sodium bulbs after 1 to 1 1/2 years of daily use. All bulbs are covered by a 1-year warranty.

AHL carries replacement bulbs for all types of systems:

Metal Halide

Metal Halide bulbs provide balanced, full-spectrum light similar to the tropical sun. Strong in the important blue area of the light spectrum, metal halide bulbs are excellent for seed-starting, cloning and vegetative growth.

The following abbreviations are commonly used to describe Metal Halide bulbs, and will help you choose the right one for your system. Please feel free to contact AHL if you have any questions about which bulb you need!

MH stands for a standard metal halide bulb, followed by the wattage. example: MH 400 is a 400 watt metal halide bulb.

MS stands for a super metal halide. A super bulb has a higher lumen intensity (more light) than a standard bulb. example: MS 400 is a metal halide super bulb, 400 watts, and it has 4,000 more lumens than the standard MH bulb.

HOR stands for a horizontally mounted bulb. These bulbs are designed to be used in a horizontal reflector. Do not mount these bulbs vertically (they will ignite, but have lower light output and burn out prematurely). example: MS 400/HOR is a 400 watt metal halide bulb for a horizontal reflector.

BU stands for base up, which means the bulb hangs vertically in the reflector with the screw end up. These bulbs are typically used in parabolic reflectors. Do not mount these bulbs horizontally (they will ignite, but have lower light output and burn out prematurely). example: MS 400/BU is a 400 watt metal halide bulb for a parabolic reflector.

U stands for a universal bulb. This means that the bulb can be mounted either horizontally or vertically, although vertical use provides higher light output and longer bulb life.

• MS 1000 Watt (125,000 Lumens), HOR  $65.95
• MH 1000 Watt (110,000 Lumens), U  $66.95
• MS 400 Watt (40,000 Lumens), HOR  $61.95
• MS 400 Watt (40,000 Lumens), BU  $61.95
• MH 400 Watt (36,000 Lumens), U  $29.95
• MS 250 Watt (23,000 Lumens), HOR  $59.95
• MH 250 Watt (20,500 Lumens), U  $29.95
• MS 175 Watt (15,000 Lumens), HOR  $49.95
• MH 175 Watt (14,000 Lumens), U  $32.95

Agrosun Gold bulbs are special Metal Halide bulbs that have an enhanced color spectrum. Agrosun bulbs have 40-50% more red light than a standard halide, and therefore produce better results in the flowering stage than a typical metal halide.

• MS 1000 Watt Agrosun Gold (125,000 Lumens), HOR  $119.95
• MH 1000 Watt Agrosun Gold (125,000 Lumens), U   $119.95
• MS 400 Watt Agrosun Gold (40,000 Lumens), HOR  $74.95
• MS 250 Watt Agrosun Gold (23,000 Lumens), HOR  $74.95

High Pressure Sodium

HPS stands for High Pressure Sodium. HPS lamps produce light mainly in the red/orange/yellow region of the light spectrum. While the HPS spectrum lacks the blue light that promotes the best vegetative growth, the heavier red light stimulates fruit and flower production when plants are in their reproductive stages. HPS bulbs are always universal, meaning that they can be burned in any position with no loss of light intensity or life span.

• HPS 1000 Watt (140,000 Lumens), U  $66.95
• HPS 600 Watt (92,000 Lumens), U  $89.95
• HPS 400 Watt (50,000 Lumens), U  $25.95
• HPS 250 Watt (27,500 Lumens), U  $24.95
• HPS 150 Watt (16,000 Lumens), U  $23.95

HPS Son Agro are special High Pressure Sodium bulbs that have an enhanced color spectrum. These bulbs have about 30% more blue light than a regular HPS, providing better performance during the vegetative growth stage.

• HPS 430 Watt Son Agro (53,000 Lumens), U  $89.95
• HPS 270 Watt Son Agro (29,500 Lumens), U  $64.95
• HPS 160 Watt Son Agro (18,000 Lumens), U  $64.95

Hortilux Bulbs are high pressure sodium lamps designed specifically for horticulture. They produce a higher PAR output (Photosynthetically Active Radiation) in the blue, green, red, and orange spectrums, promoting vigorous plant growth. Hortilux bulbs also have a more balanced lumen output throughout the color spectrum, as well as higher overall lumen output.

• HPS 1000 Watt Hortilux (145,000 Lumens), U  $119.95
• HPS 600 Watt Hortilux (88,000 Luments), U  $117.95
• HPS 400 Watt Hortilux (55,000 Lumens), U $92.95

HPS SolarMax Bulbs are some of the brightest HPS bulbs around.

• HPS 1000 SolarMax (147,000 Lumens), $121.95
• HPS 600 SolarMax (95,000 Lumens), $99.95

Gavita Bulbs are the latest advance in HID lighting technology. Their revolutionary design features the reflector built INSIDE the glass of the bulb! Having the reflector so close to the bulb's arc tube provides maximum light efficiency, no hot spots, and cooler operating temperatures. Gavita bulbs do not require a reflector but they can be used inside most traditional horizontal reflector designs.

• HPS 600 watt Gavita bulb (95,000 Lumens), U  $119.95
• HPS 400 watt Gavita bulb (45,000 Lumens), U  $94.95

Conversion Bulbs

Conversion Bulbs are specially designed to run off one type of ballast but provide the other spectrum of light. This allows the gardener to operate one light system and switch bulbs according to the plants' stage of growth (vegetative or flowering). HPSC bulbs are high pressure sodium bulbs designed to burn in a metal halide ballast. MHC bulbs are metal halide bulbs designed to burn in a high pressure sodium ballast.

Metal Halide to High Pressure Sodium Conversion Bulbs

• HPSC 940 Watt (130,000 Lumens), U, for MH 1000 watt  $189.95
• HPSC 360 Watt (45,000 Lumens), U, for MH 400 watt  $117.95
• HPSC 220 Watt (25,000 Lumens), U, for MH 250 watt $112.95
• HPSC 150 Watt (15,000 Lumens), U, for MH 175 watt  $104.95

High Pressure Sodium to Metal Halide Conversion Bulbs

• MHC 1000 Watt, U, for HPS 1000 watt  $119.95
• MHC 600 Watt, U, for HPS 600 watt  $119.95
• MHC 400 Watt, U, for HPS 400 watt  $64.95
• MHC 250 Watt, U, for HPS 250 watt  $84.95