Ballasts All Sizes
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Fluorescent: Interesting Facts
Recessed fluorescent lighting is a common feature in today's modern offices as well as commercial buildings like airports, railway stations, underground metro rail terminus, etc. The basic advantage that the people see in using them is that they provide the necessary illumination without coming in the way of the existing layout and decor of that building. In fact, some of us well argue that diffused Fluorescent Light actually enhances the beauty of that place!
LED lighting is truly the next generation technology which features numerous benefits to not only consumers for Home LED Lighting, but businesses alike, with LED Downlighting products and LED Tubes which can replace out-dated, buzzing fluorescent lighting. LED lighting offers such benefits as a higher energy efficiency than CFLs and fluorescents, lower power consumption, lower maintenance costs, longer lifetime (50,000 hours compared to less than 10,000), durability and brighter light output than conventional fluorescent lighting. LED lighting is slowly filling the Home Lighting and Business Lighting market place with such innovative products as LED T5 and LED T8 Tubes, Flexible LED Lighting, and LED Down Lighting.
Fluorescent Lighting equipment is available in many shapes and sizes therefore it is not difficult to find one that suits your requirement.
Fluorescent lighting contains toxic materials such as mercury which is harmful to environment and human body. For workers and personnel who replace fluorescent tubes at work such as electricians are the most impressed by LED tubes, since they are not only easier to install, requiring no ballast, but they are worry-free, as they can last upwards of 10 years, on for 24 hours a day, and do not contain any toxic materials like mercury dust that fluorescents do. Contrary to popular belief, LEDs are very easy to install in this day and age, and the bulk of LED products are now "plug-and-play" while still offering a slick look with unmatched energy savings.
Although fluorescent lighting is more energy efficient than incandescent lighting, it is still an energy wasting monster when compared with LED lighting. For businesses who have a large electric bill, switching to LEDs could cut your energy bill in half, while still keeping all of the brightness, and no fluorescent flickering! Even with the most advanced state of the art CFLs, fluorescent lighting accounts for a high percentage in existing lighting all over the world, switching from fluorescent lighting into LED lighting can greatly reduce the global lighting power consumption and greenhouse gas emissions.
The industry standard in recessed Fluorescent Light is the one with an inverted T-Junction at the ceiling. This helps in easy fixing and maintenance, However if the ceiling is made of sheet rock or plaster, there is an even better option in the form of flanged fluorescent light. In order to reduce glare, in places where there is more usage of computers or there are also air-conditioning and heating fixtures in the vicinity, it is better to go for parabolic fluorescent lighting.
First of all, LED lighting is more energy efficient than fluorescent lighting due to the high efficacy of LEDs. LEDs for interior lighting have already broken the efficacy record of 100 lumen per watt, while fluorescent lighting only has an efficacy of around 60 lumen per watt. LED has a power factor of 0.9, which means most of the power is converted into light, but when fluorescent lighting works, a huge amount of power is converted into heat which will be dispersed finally.
Secondly, Flexible LED lighting has a much longer lifetime than fluorescent lighting since LED lighting is solid state lighting which more stable and reliable. LEDs can last over 50,000 hours which means 17 years under normal use. Whereas fluorescent lighting only has a lifetime of around 5,000 hours, which means you have to replace them as often. Using LED lighting can greatly save your expenses which are used to buy new light bulbs and pay for the labor.
Fluorescent lighting is also available in form of fixtures that operate on battery packs. This gives a great option for use where the power supply is erratic and prone to frequent shut-downs. Due to this very important feature we find recessed fluorescent light is used as a rule at places like hospitals and nursing homes as well as airports and important public buildings.
If you enjoyed this article then you could also enjoy discovering about Full Spectrum Compact Fluorescent Light Bulbs as well as Fluorescent Black Light Bulbs.
Questions on Ballasts All Sizes
What size resister (OHM & WATTS) and configuration do I use with 4.2amp 24v output DC & 2.4v-2.8v 700ma LED?
I believe you divide 4.2 by .700 to get a 6 across ballast and a series of 8 but I'm not sure and I will be purchasing my resister from All-electrics which list their resisters in terms of ohms and watts I also need the same info for the same size led but for a 1.5 amp 12v output. I would greatly appreciate how you calculate to get the answer in simple terms a none tech type like myself can comprehend.
Subtract the LED voltage from the power supply voltage. 24 - 2.4 = 21.6 V. This is the voltage that will be "dropped" across the resistor. We use the lower end of the LED's voltage to make sure current is kept within safe limits.
Then calculate your series resistor R by dividing that voltage by the maximum acceptable LED current: 21.6V / .7A = 31 ohms. 33 ohms is a very close standard value.
The power dropped in this resistor will be V squared / R = 21.6x21.6 / 33 = 14.1 watts
Or if you prefer, I squared x R = 0.7 x 0.7 x 33 = 16.2 watts
The discrepancy is because we adjusted the resistor value; so the actual current will be slightly less than 700 mA.
You'd want at least a 20 watt resistor.
That's a LOT of power to throw away with an LED that's using less than two watts. A switching current regulator would be a much better approach.
For the 12V supply.. 12-2.4 = 9.6V
9.6V / .7A = 13 ohms. Use 15 ohms
P = 9.6 x 9.6 / 15 = 6.1 watts... use a 10 watt resistor. Still a lot of power to throw away.
The current rating on the power supply doesn't enter into the calculations.
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