hexthat
Well-Known Member
wiki said:Chlorophyll a is the most common of the six, present in every plant that performs photosynthesis. The reason that there are so many pigments is that each absorbs light more efficiently in a different part of the electromagnetic spectrum. Chlorophyll a absorbs well at a wavelength of about 400-450 nm and at 650-700 nm; chlorophyll b at 450-500 nm and at 600-650 nm. Xanthophyll absorbs well at 400-530 nm. However, none of the pigments absorbs well in the green-yellow region, which is responsible for the abundant green we see in nature.
Bulbs in the range of 2700 to 6500 on a kelvin scale is ideal for growing
If this is indeed true then it would be wise to use mostly 450nm and 650nm? I can't find those where I buy LEDs http://www.superbrightleds.com
So I would go with
5mm White LED
[TABLE="class: moreinfo_table"]
[TR]
[TD="class: odd"]Color[/TD]
[TD="class: even"]Cool White[/TD]
[TD="class: odd"]Color Temperature[/TD]
[TD="class: even"]5400 K[/TD]
[/TR]
[TR]
[TD="class: odd sorting_1"]Continuous Forward Current[/TD]
[TD="class: even"]30[/TD]
[TD="class: odd sorting_1"]Forward Voltage[/TD]
[TD="class: even"]3.5V[/TD]
[/TR]
[TR]
[TD="class: odd"]LED Package[/TD]
[TD="class: even"]5 mm (T-1 3/4)[/TD]
[TD="class: odd, width: 25%"]Lens Color[/TD]
[TD="class: even, width: 25%"]Clear[/TD]
[/TR]
[TR]
[TD="class: odd sorting_1, width: 25%"]Lumen[/TD]
[TD="class: even, width: 25%"]1.2 Lumen[/TD]
[TD="class: odd sorting_1, width: 25%"]Maximum Forward Voltage[/TD]
[TD="class: even, width: 25%"]4V[/TD]
[/TR]
[TR]
[TD="class: odd, width: 25%"]Millicandela[/TD]
[TD="class: even, width: 25%"]2500mcd[/TD]
[TD="class: odd, width: 25%"]Operating Temperature[/TD]
[TD="class: even, width: 25%"]-20~+80 °C[/TD]
[/TR]
[TR]
[TD="class: odd sorting_1, width: 25%"]Peak Forward Current[/TD]
[TD="class: even, width: 25%"]100mA[/TD]
[TD="class: odd sorting_1, width: 25%"]Power Dissapation[/TD]
[TD="class: even, width: 25%"]80mW[/TD]
[/TR]
[TR]
[TD="class: odd, width: 25%"]Reverse Current[/TD]
[TD="class: even, width: 25%"]10µA[/TD]
[TD="class: odd, width: 25%"]Reverse Voltage[/TD]
[TD="class: even, width: 25%"]5V[/TD]
[/TR]
[TR]
[TD="class: odd sorting_1, width: 25%"]Storage Temperature[/TD]
[TD="class: even, width: 25%"]-30~+100 °C[/TD]
[TD="class: odd sorting_1, width: 25%"]Total Power Consumption[/TD]
[TD="class: even, width: 25%"]0.105 Watts[/TD]
[/TR]
[TR]
[TD="class: odd, width: 25%"]Tube Diameter[/TD]
[TD="class: even, width: 25%"]T1-3/4[/TD]
[TD="class: odd, width: 25%"]Viewing Angle[/TD]
[TD="class: even, width: 25%"]45 degree[/TD]
[/TR]
[/TABLE]
5400k peaks at 450nm
If I want to power it with 5v DC 1.5A what kind of resistors do I need?
(yellow violet black) to keep it below max or (orange white black) to max it out?
With (yellow violet black) I can run 60 LEDs?
With (orange white black) I can run 50 LEDs?
This should only be 7.5 watts?
Can I use just one resistor on the ground?