How large a ballast for a 15W LED light
When the ballast is activated in the fluorescent lamp, the fluorescent powder is activated by high pressure, which makes the tube glow. After the completion of the ballast, the ballast will be reduced to the voltage limit, reducing the voltage to about 150V.
LED lamp USES constant current source, not ballast, the output power of constant current source should be greater than 100W, depending on the design margin First, the LED power supply is not a ballast. Second, leds are current components, which generally do not work in constant resistance mode (except for factory testing). In the end, you figure in the power supply on the nameplate SEC secondary output parameters have said very clear, such as the first figure 7-12 v DC, 700 ma this parameter, it says can drive the biggest 12 * 0.7 = 8.4 W illuminant. The first...
The key is the light effect of leds. The light effects of LED lights are now available on the market from 40LM/W ~ 100LM/W, depending on what you buy. Incandescent lamp's light efficiency is about 10 lm/W, LED the whole light if is cheap in forest products is estimated to be 30 to 40 lm/W, can go to 60-70 lm/W, philips on light fair show samples can go to 90 lm...
The lamp band of 15W will be able to power the constant current switch between 15W and 20W LED lamp does not need ballast, high power LED is made of drive power supply, it generally according to the power points have 1 w, 3 w, 5 w, 6 w, 9 w, 12 w, 15 w, 18 w, these are the wall lamp, ceiling lamp 25 w, 30 w, these are generally courtyard lamp 60 w, 80 w, 120 w these used in street lamps; Like our usual LED flashlights, don't drive the power supply, directly on the battery or on the battery..
