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tracknut Posted - 05/25/2012 : 09:00:49 AM
I'm going to be putting some LED lighting in a new construction house, and don't even know the basics. Maybe someone could answer a couple questions for me...

1. What's the difference or reasoning for buying a complete LED fixture (at higher cost), versus screwing an LED bulb into a traditional incandescent fixture?

2. To get the best performance out of an Insteon system (on/off/dim), what are the key items I should have on my "must have" list as far as LED fixtures and bulbs.

Thanks
Dave
9   L A T E S T    R E P L I E S    (Newest First)
stusviews Posted - 08/19/2012 : 4:12:04 PM
quote:
Originally posted by vstlighting

quote:
Originally posted by stusviews

1. Design and style. There are only a limited number of LED bulbs that screw into incandescent sockets.

2. If you want on/off/dim, then the LED fixture/bulb MUST be dimmable. Not all are.



Well, I don't really think only limited number of led bulbs that can screw into incandescent sockets. The manufacturers know that the led bulb is mainly to replace the existing incandescent lamp, in order to lower the replacement cost, the lamp cap, shape, etc. are all designed according to the incandescent lamp.

So I think no need to buy a complete led fixture, you can find the replacement led bulb easily.


I didn't mean that retrofit LEDs have a limited supply, only that there are a number of different LEDs that fit only in fixtures designed specifically for them, thus providing a greater range of lighting fixture designs and styles
Geo Posted - 08/19/2012 : 1:10:50 PM
I addressed this in a previous posting "Calculating dimmable LED wattage". This is a big problem for power generation and distribution companies. While the average current is low, it in fact comprises a train of current pulses, often significantly higher than the average. The generators and wiring must be rated for the pulse levels, which makes the equipment more expensive than it would be needed if the average was to be sold.
BLH Posted - 08/19/2012 : 08:11:26 AM
If the LED Bulbs are dimmable and on a dimmer control.
Inrush and repetitive peak current must be addressed by the bulbs manufacture and the dimmers manufacturer.
Many times a LED bulb that uses 15 watts of power can have peek currents comparable to a 115 watt incandescent bulb.
So you could think I have 10 bulbs on my dimmer. That is about 150 watts. A 600 watt dimmer should be fine. Well it may not if the current spikes damage the electronics.
vstlighting Posted - 08/19/2012 : 06:09:24 AM
quote:
Originally posted by stusviews

1. Design and style. There are only a limited number of LED bulbs that screw into incandescent sockets.

2. If you want on/off/dim, then the LED fixture/bulb MUST be dimmable. Not all are.



Well, I don't really think only limited number of led bulbs that can screw into incandescent sockets. The manufacturers know that the led bulb is mainly to replace the existing incandescent lamp, in order to lower the replacement cost, the lamp cap, shape, etc. are all designed according to the incandescent lamp.

So I think no need to buy a complete led fixture, you can find the replacement led bulb easily.
Geo Posted - 05/26/2012 : 4:50:34 PM
Heat dissipation is one problem inherent to the LEDs. It has direct impact on the bulb's life expectancy - it's very similar to what happened to microprocessors used in cell phpnes. To reduce the cost the wafer size was reduced which causes the micro to run at a higher temperature. Consequently, the life expectancy of these micros is around three years - fortunately they don't run continuously. The argument is that many people buy a new phone in three to five years anyway. I suspect this will happen with the LED lights. The life will be traded off against the size of the heatsink and thus cost.
BLH Posted - 05/26/2012 : 03:27:48 AM
Yes heat can be a big factor.
I have a EvoluxS bulb. It actually has a miniature fan in it. Well you probably have guessed by now. Fans wear out and now it sounds like a model plane flying around.
oberkc Posted - 05/25/2012 : 5:37:03 PM
Dissipation of heat is arguably more critical for LEDs. Another difference with an integrated fixture/lamp is that it can be designed with this in mind, having the fixture act as heat sink and radiator. I recall seeing some LED lamps with the caution to avoid putting them into enclosed fixtures.
tracknut Posted - 05/25/2012 : 3:46:06 PM
Great, thanks for the info Stu.
Dave
stusviews Posted - 05/25/2012 : 11:15:06 AM
1. Design and style. There are only a limited number of LED bulbs that screw into incandescent sockets.

2. If you want on/off/dim, then the LED fixture/bulb MUST be dimmable. Not all are.

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