What type of bulb to use with my color organ ?

On Feb 3, 9:50=A0pm, sku_dave wrote: > I'm making a kind of light tower with 2" clear acrylic rod (3x 6' > tall), and putting lights underneath that'll be plugged into my color > organ to react to music. >

LEDs can be controlled quite well by regulating the current which can be done by PWM or with an analog current source. See page 10 of

I used a Burr-Brown Operational Transconductance Amplifier to drive an LED from nearly off to full brilliance at 30 MHz for testing photo sensors for a telecine (film to video). The linearity ramp was also excellent.

GG

Sorry, guess I wasn't clear enough. I'm wondering how these -

On Feb 3, 10:35=A0pm, sku_dave wrote: > > LEDs can be controlled quite well by regulating the current which can > > be done by PWM or with an analog current source. See page 10 of >

Well, it says it works well with dimmers. Isn't that what a color organ is? An audio driven lamp dimmer? OK you do band separation but it's still a fancy light dimmer at its core.

GG

Well I guess I totally missed that, good point. Hopefully it works out ! Thanks.

You buy color bulbs. A limited selection is available at the local hardware store, but a dedicated lighting store is likely to have more colors.

Smaller color organs could get by with Christmas tree bulbs, the old kind that run directly off 120VAC.

If you can't find enough or the right colored bulbs, then you put regular incadescent spotlights behind color filters (available at stores that sell theatre lighting).

Michael

LED "bulbs" or LEDs? LEDs can certainly be driven at any level between dark and as bright as they go, simply by providing an appropriate drive current. LED "bulbs" designed to replace incandescent bulbs may or may not be dimmable, depending on the circuit used in the "bulb".

You can PWM (Pulse Width Modulation) the LED's , that'll give you the luminance effects you are looking for. Of course, You need a PWM modulator circuit for that.

When you're ready for that stage, just ask.