So my little project will be using LED's. I want to power about 6 LED's with a power pack.
this is the LED's I just ordered,
Source Material:InGaN !
Emitting Colour:5MM WHITE LED
LENS Type:Water clear
Color Temperature: --
Luminous Intensity-MCD: Typ: 35,000 mcd
Reverse Voltage:5.0 V
DC Forward Voltage: Typical:
DC Forward Current:20mA
Viewing Angle:25 degree
Lead Soldering Temp:260°C for 5 seconds
This is the battery I am thinking about getting:
Battery Specs:
6 Volt Rechargeable
4.5 Amp Hours
W-2.76" X D-1.89" X H- 4.25" -4" high not including the tabs
Weight- 1.85 lbs
Terminals - faston tab type
Interstate Model # SLA 0905
Will I be able to make this battery work reliably with the 6 LED's?
35,000mcd at only 20mA means the LEDs are focussed into a very narrow angle.
Sparkfun sells a very bright white LED that produces only 9,000mcd at 20mA with an angle of only 10 degrees.
35,000mcd at only 20mA means the LEDs are focussed into a very narrow angle.
Sparkfun sells a very bright white LED that produces only 9,000mcd at 20mA with an angle of only 10 degrees.
I might be more interested in these, mainly because I'm going for flood lighting for a room and not focused lighting. Maybe I will browse some of their LED's before I go too far...TY!
On second thought, I think I am going to use the first LED's I posted just to get the project going. they have a 25 degree angle and I can work with that.
Since their max forward voltage is 3.6V, you can't run two in series from a battery that is only 5.9V as it discharges. You must run them in parallel, each with its own current-limiting resistor. The ones you linked are not suitable for flood illumination, because they only have a 25degree beamwidth.
A moment ago the same LED was 3W but now it is only 1W. Why? Did the 3W LEDs melt?
An ordinary white LED has a current of 20mA and a voltage of 3.5V. Then its heating is 0.07W. It might get slightly warm.
The 3W LED has a current of 700mA and a voltage of 3.5V so its heating is 2.45W (35 times more heat!). There is no detailed datasheet to tell you about the specs for a heatsink nor how to fasten it to a heatsink.
If you reduce the current then it will be cooler but the color might change (again there is no detailed datasheet).
The 3W LED is made by an unknown manufacturer and might fail soon. I always buy name-brand parts that seem to last forever.