Formula for deciding High Bay Quantity (Close to a 20_ft ceiling) in your workplace (to replace CFLs or Metal Halides).Generalized Advantages of LED
1: Multiply the Length of the building X's the width of the building (only the area you want illuminated)
2: Divide that by 450
Example: 100ft X's 60ft = 6000sqft
Then: 6000 divided by 450 = 13.33 (so for an even number of lights, 14 is the qty)
Then you simply install them evenly and the down ray will overlap the next for total illumination.
EFFICIENCY: LEDs emit more lumens per watt than incandescent light bulbs. The efficiency of LED lighting fixtures is not affected by shape and size, unlike fluorescent light bulbs or tubes.
WARMUP TIME: LEDs light up very quickly. A typical LED will achieve full brightness in under a second.
CYCLING: LEDs are ideal for uses subject to frequent on-off cycling, unlike incandescent and fluorescent lamps that fail faster when cycled often, or high-intensity discharge lamps (HID lamps) that require a long time before restarting.
COOL LIGHT: In contrast to most light sources, LEDs radiate very little heat in the form of IR that can cause damage to sensitive objects or fabrics. Wasted energy is dispersed as heat through the base of the LED.
SLOW FAILURE: LEDs mostly fail by dimming over time, rather than the abrupt failure of incandescent bulbs.
LIFE SPAN: LEDs can have a relatively long useful life. One report estimates 35,000 to 50,000 hours of useful life, though time to complete failure may be longer. Fluorescent tubes typically are rated at about 10,000 to 15,000 hours, depending partly on the conditions of use, and incandescent light bulbs at 1,000 to 2,000 hours. Several DOE demonstrations have shown that reduced maintenance costs from this extended lifetime, rather than energy savings, is the primary factor in determining the payback period for an LED product.
SHOCK RESISTANCE: LEDs, being solid-state components, are difficult to damage with external shock, unlike fluorescent and incandescent bulbs, which are fragile.
FOCUS: The solid package of the LED can be designed to focus its light. Incandescent and fluorescent sources often require an external reflector to collect light and direct it in a usable manner. For larger LED packages total internal reflection (TIR) lenses are often used to the same effect. However, when large quantities of light are needed many light sources are usually deployed, which are difficult to focus or collimate towards the same target.