HPS bulbs such as 600W HPS , 50W HPS , 400W HPS , 35W HPS , 50W HPS , and 250W HPS among others use sodium to generate light.HPS bulbs such as 600W HPS , 50W HPS , 400W HPS , 35W HPS , 50W HPS , and 250W HPS among others use sodium to generate light. The bulbs are very economical and efficient in relation to the energy consumed and thus , their usage is rampant in most applications. The bulbs are highly used in outdoor lighting , street lighting , and indoor lighting. The HPS bulbs also come in a wide array of wattage and sizes and range from 70 to 1000 watts but the most common watts include 35W HPS , 50W HPS , 70W HPS , 250W HPS , 400W HPS , and 600W HPS among others. It is also imperative to note that the size of the bulbs vary based on the wattage. The higher the watts a bulb has , the bigger is its size. The length of bulbs also varies from a few inches for 35W HPS bulb to 12 inches for the longest bulb. The bulbs are also characterized with a large mogul base. The 600W HPS bulb and others also require a ballast to ensure constant supply of power. The bulbs provide higher light output in relation to the fluorescent bulb. For example , a 50W HPS bulb compares favorably to a 60W fluorescent bulb. This is because the 50W HPS bulb will consume lower energy than the fluorescent. Moreover , the light generated by 400W HPS or 50W HPS bulb has a distinguishable orange glow trademark. The light is characterized by red-dominant wavelength and being extremely bright. Hence , it is highly necessary to wear eye protective gear when working near them especially the exceedingly bright bulbs such as the 600W HPS bulb. The HPS bulbs are also characterized by high market prices. The prices vary by manufacturer but , they are extremely expensive compared to fluorescent bulbs. Since the HPS bulbs are convenient and highly efficient , they are popularly used in street lighting. The HPS bulbs such as 50W HPS are used as decorative lighting to illuminate offices and houses. Moreover , the 400W HPS bulbs are highly used as security lighting in most applications. The high lighting bulbs such as the 400W HPS and 600W HPS bulbs have become common with indoor gardening enthusiasts. This is because their bright light imitates the sun intensity and their trademark influential red spectrum output plays an important role in stimulating the plants growth especially the flowering stage. However , it is imperative to ensure the plants in indoor garden receive the optimal light intensity by using higher bulbs such as the 600W HPS. Although HPS bulbs such as the 600W HPS , 400W HPS or 50W HPS are convenient , efficient and applicable in most applications , they are prone to eye side effects especially the extremely bright bulbs. Therefore , when in close proximity with brighter bulbs such as the 600W HPS , it is necessary to wear eye protective gear. Moreover , it is unwise to gaze at the bulbs as they can harm the eyes. It is also imperative to ensure proper ventilation as HPS bulbs produce heat. It is also important to note that the HPS bulb last longer without maintenance and thus , have low maintenance cost.