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### Topic: dimming lots of lightbulbs (Read 1 time)previous topic - next topic

#### fubbi

##### Nov 29, 2011, 08:51 pm

Hi

I would like to dim a bunch of (like 400) standard incandescent lightbulbs.

a. Can I run a standard bulb on DC? It would make things a lot simpler
b. Can I dim (plenty and fast) a standard bulb with PWM?

Basically I want to treat a bulb like a LED, but with a sturdier schematic of course...

cheers folks!

fubbi

#### Magician

#1
##### Nov 29, 2011, 09:12 pm
a. Yes.
b. Yes.
There are not much difference between LED and bulbs, except thermal inertia, which is good for PWM

#### fubbi

#2
##### Nov 29, 2011, 11:35 pmLast Edit: Nov 29, 2011, 11:46 pm by fubbi Reason: 1

a. Yes.
b. Yes.
There are not much difference between LED and bulbs, except thermal inertia, which is good for PWM

awesome, thanks!

Now how do I calculate the amount of DC current a bulb with say 40w needs?

Basically, I intend to do this like I would a LED matrix, a 74HC595 shift register can't handle this right?
Do I need something more powerful, or transistors?

I am looking for the minimal solution, space and budget wise to do this...

fubbi

#### Paulcet

#3
##### Nov 30, 2011, 07:17 pm

Now how do I calculate the amount of DC current a bulb with say 40w needs?

P=E*I

So, if your bulbs are powered with 24 volts: 40W=24V*?A
40/24=1.67amp
Quote

Basically, I intend to do this like I would a LED matrix, a 74HC595 shift register can't handle this right?
Do I need something more powerful, or transistors?

Yes.

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