How to take apart an led bulb

[woodlandfarms]

We are having trouble with Cree led fitting in some if our fixtures. Just to tall. If you hold the light up to another light you can see where the stem ends. And it will fit without the outer globe. So how to take the glass off. Tried razor bladin the silicone. No luck. But on another site they suggested putting the globe in the oven for 20 minutes at 200 degrees. Use thick gloves in case of breakage. Twist hard and it does indeed pop off.

 

[grsthegreat]

another thing i am finding with LED indoor light bulbs...most say not for use in totally enclosed fixtures.....somewheres in fine print.

Most household light fixtures have enclosed globes. so these wont work. They dont last very long.

nice..aint it.

I was over at H Depot last week and saw 4 packs for $19.95. I was tempted to try a pack in the living room lights...till i read the small print on the box

 

[woodlandfarms]

Can you take a picture or link of the fixtures in question. Led need the same amount of air movement as inca descents. I would think led would work in you fixtures. I think the warning us related to people thinking they run lots cooler and don't need air flow

 

[MotorSeven]

I don't get the "not for enclosed fixture" thing. They produce minute amounts of heat, they already have a sealed glass/plastic bulb around them......so why that caveat?

 

[grsthegreat]

its printed right on the packages under warnings. I went onto home depots Cree link specifications, and all it gives is whose dimmers you can use and how many leds/dimmer. I looked up the 600 watt meistro dimmers i have. currently i can run 10 - 60 watt incandescent per dimmer, but only 8 led dimmers. what the heck. if they run cooler, why does cree require less per dimmer???

tell ya what ill do, next time im in the Depot ill take a picture of the cartons.

 

[MotorSeven]

I say stick one in a "enclosed fixture" and put on shooting glasses and a flak jacket & stand back:laughing:

 

[Raspy]

LED themselves use minimal power, but the power supply in the base of the "bulb" does use some. It looks like the power supply uses more power than the LED itself. That must be why they have cooling fins all over the new bulbs.

LEDs need about 2 volts DC. The higher the voltage the brighter they are, but the shorter their life. The trick is to make them put out enough light and run on 120 volts AC. This can be a group hooked in series, like 60 of them running on a 120 volt circuit, for 2 volts each, or some other method. And some way of making them see DC current so they stay on and not strobe.

We are bound to see the cheapest method of achieving this, and widely varying designs, until the market settles down and we get the lowest lifespan and cheapest manufacturing process that can be sold to us.

LED flashlights are a good example of this. Some last a long time and some don't. Some actually get hot in the electronic power supply while the LED stays cool, wasting battery power as heat in a parasitic load.

 

[woodlandfarms]

Grs. I am sorry. Yes I do know the Cree lights have the warning. I am just wondering what kind of fixture you are putting them in that you think might not have enough airflow. Raspy has it right. The metal that you feel when you handle the led bulb is a huge heat sync. Led lights tend not to fail, it's the transformers.

I don't know you fixtures but if they take incandescents you should have no problem with led

Btw, Home Depot messed up and was selling the new 75 watt Cree for the 60 watt price. About an 8 dollar savings per bulb.

 

[Ken45101]

LED themselves use minimal power, but the power supply in the base of the "bulb" does use some. It looks like the power supply uses more power than the LED itself. That must be why they have cooling fins all over the new bulbs.

Which makes me wonder how really efficient they are. Yes, the bulbs might be efficient, but the overall system? Large cooling attachments are NOT the sign of a high efficient system.

 

[woodlandfarms]

I agree ken. I never thought they would get as warm as they do. (150 degrees or so). But when I put them on my kilowatt they really are pulling only as rated.