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Old 10-21-2010, 08:20 PM   #1
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I'm designing a high-end LED bulb and need your input.

I made a couple posts in a thread in the "Dollars and Cents" forum about a LED bulb for my RV that I am designing (I'm a self-taught electrical engineer).

This will be a high-end bulb with extra features such as:
- Constant light output with battery voltage from 11V to 16V.
- Soft start (fades up)
- Low power and nightlight modes (by turning light quickly off and back on)

I just received parts for the prototype it looks good. Full power mode (same lumens as a 921 bulb) pulls 0.4 Amps. Low power mode (which is still pretty bright) pulls 0.2 Amps. And nightlight mode pulls about 0.03 Amps.

I have the different modes working that microcontroller that is easy to program, but is NOT the one that will be in final design (it's too expensive).

I'm looking for ideas for other features that I might design into this. What features would you want in a LED bulb replacement ?

Someone already mentioned a ultra-efficient design, and I may tackle that after this one.

Bean
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Old 10-21-2010, 09:37 PM   #2
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ohhhh. self dimming? sounds good.
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Old 10-21-2010, 10:21 PM   #3
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How about a time delay for off. That way you could switch it off, the get in the bed before it goes out. Not all RV's have a light handy to the bed. May not need to be a separate feature, just put in a 30 second delay off.

And it needs to be cheap. By the way, processor controlled, what is the power draw when in the "off" mode?
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Old 10-21-2010, 11:48 PM   #4
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Between your original idea and windrider's suggestion, I can't think of anything else to add.
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Old 10-22-2010, 12:34 AM   #5
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i dont think he could do such a thing as having it last 30 seconds once the power is off.
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Old 10-22-2010, 08:39 AM   #6
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Yeah, this is just a bulb replacement. So I can't have it on when the switch is off. No power. And when the switch is OFF there is no current used.

What I could do is have a slow-off mode where is slowly dims the light until the bulb is off (the switch is still on). Then to turn the light on again you flip it off and on.

Something like this would work:
(switch is off)
Turn switch on - light is in constant on, full brightness mode.
Flip switch off and on - light is in "slow off" mode (5 minutues until full off).
Flip switch again - light is in constant on, half brightness mode.
Flip switch a 3rd time - light is in constant on, night-light mode.

What do you think of that ?

Bean
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Old 10-22-2010, 09:17 AM   #7
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My experience with some of the replacement LED's curently on the market is a poor fitting "wedge" to snap into the original fixture. My unit uses mostly 921 style bulbs, and the new plastic wedges seem loose and wobbly ... I jammed the end of a tooth-pick (plastic) in a few just to keep them tight!
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Old 10-22-2010, 09:48 AM   #8
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Hi Bean,

Some handy information to help in your endeavor.
Super Bright LEDs - LED Information
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Old 10-22-2010, 10:28 AM   #9
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Quote:
Originally Posted by The_Stuff View Post
i don't think he could do such a thing as having it last 30 seconds once the power is off.
Why? That actually seems easier to do than some of the other ideas. A suitably sized capacitor should be able to provide power to the LED for whatever time you needed. No?

There are actually very cheap AA battery powered LED lights that do something similar. I have a motion activated light (bought at home depot) in the bedroom that we use to provide "getting into (and out of) bed light" without touching anything. I did need to use some black electrician's tape to carefully block the sensor to it would not trip when we rolled over at night but would work when we got up or walked into the room.
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Old 10-22-2010, 10:48 AM   #10
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true but it will feed back into the system to unless it has diodes in it and thats increasing the price per bulb i would assume.

i think bean has it right on with the latest steps of
=====================================
(switch is off)
Turn switch on - light is in constant on, full brightness mode.
Flip switch off and on - light is in "slow off" mode (5 minutues until full off).
Flip switch again - light is in constant on, half brightness mode.
Flip switch a 3rd time - light is in constant on, night-light mode
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