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Re: exploding bulbs [Re: schenimann] #210580 07/11/13 06:35 PM
Joined: Mar 2005
Posts: 1,803
Alan Belson Offline
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Led ratings for lumens are about a tenth of the amperes consumed by an 'equivalent] tungsten bulb: whatever that means! Temperature is not equal to energy: the led needs a heat sink on the diode to keep it cool, [ because it is so small, it has a small radiating area], otherwise its life is shortened. The actual heat quantity emitted will be far lower than a conventional equivalent bulb, since more energy is converted to light.


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Re: exploding bulbs [Re: schenimann] #210589 07/11/13 11:00 PM
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HotLine1 Offline
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Alan:
Thanks for that. I've seen LED bulbs with large heat sinks, but I personally have no experience with them. Where I was/am going with this 'heat' thing is to compare the radiated heat of a PAR/HAL and/or HR lamp to the equivilent lumen output LED.



John
Re: exploding bulbs [Re: schenimann] #210637 07/17/13 05:03 PM
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boora2 Offline
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Made in China.

Re: exploding bulbs [Re: schenimann] #210664 07/18/13 11:55 PM
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schenimann Offline OP
Member
I am going to try to sell them on changing over to LED bulbs. I think they will find the investment worthwhile. That being said, in this world of LED manufacturers where is the quality?

I just installed 40 par30 LEDs from TCP in a new house. I only install quality products and want to know what will be best for them. TCP, Verbatim, Sylvania, etc?

Re: exploding bulbs [Re: HotLine1] #210756 07/29/13 06:46 PM
Joined: Mar 2013
Posts: 46
NickD Offline
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Originally Posted by HotLine1
Alan:
Thanks for that. I've seen LED bulbs with large heat sinks, but I personally have no experience with them. Where I was/am going with this 'heat' thing is to compare the radiated heat of a PAR/HAL and/or HR lamp to the equivilent lumen output LED.



The reason for the heatsink is all physics. You have a fixed unit quantity of heat... say 10 watts. Apply that heat to a small 10 gram mass... it'll be HOT. Apply those 10 watts to a 10kg mass... you might or might not feel a difference.

The heat sinks are large mostly because there is no accompanying fan, so they have a very high surface area to encourage convection currents over the fins.

Last edited by NickD; 07/29/13 06:49 PM.
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