wow, i am really grateful to all of your replies... i wasnt expecting to get so many...
here are the exact LED's i am using:
http://ledshoppe.com/Product/led/LE1015.htm
Quote:
Emitted Colour : OCEAN BLUE
Size (mm) : 5mm T1 3/4
Lens Colour : Water Clear
Peak Wave Length (nm) : 465 ~ 470
Forward Voltage (V) : 3.2 ~ 3.8
Reverse Current (uA) : <=30
Luminous Intensity Typ Iv (mcd) : Average in 6000
Life Rating : 100,000 Hours
Viewing Angle : ±10°
Absolute Maximum Ratings (Ta=25°C)
Max Power Dissipation : 80mw
Max Continuous Forward Current : 30mA
Max Peak Forward Current : 75mA
Reverse Voltage : 5~6V
Lead Soldering Temperature : 240°C (<5Sec)
Operating Temperature Range : -25°C ~ +85°C
Preservative Temperature Range : -30°C ~ +100°C
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i used this to figure out what resistor i should use:
http://home.cogeco.ca/~rpaisley4/LEDcalc.html
the data i entered into that calculator is as follows:
Quote:
Supply Voltage: 6.5
Voltage Drop Across LED: 3.2
Desired LED Current: 30
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this is where i recieved my 110 ohm resistor... if i understand AL, he is saying that i calculated the voltage as if it were DC, and didnt take into account the
range of AC, so the
real current is 18.32, and from a couple people i apparently misunderstood my LED data, and the actual drop across the led is 3.7, the actual resistor needed is a 487ohm and 0.4386 watts...
now, i still have a few questions
how do i know a resistors wattage?
and, why wouldent i be able to use LED's in parallel? according to this:
http://led.linear1.org/led.wiz i should be able to...