But really, my point is about the heat.. a nice clean incadescent ain't so bad. I did some quick reading averages with a temp. gun on some bulbs of various conditions, and thought I'd share this.

Moral of the story, check your bulbs when you are shopping out your PF etc. If they are burnt or discolored, toss them. If applicable, gap the bulbs away from your inserts and plastics. Don't get angry at people that maintain their machine with clean incandescents.. the key is maintenance.

[edit] oh and the photos are:

Bright multi SMD
Clean no.47
Clean no.44
Burnt no.47
Very burnt (AKA Death Star) no.44

led-temps (resized).png

#2 3 years ago

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ForceFlow

Pinside Moderator

9y 236K 31,315 268 14

Interesting--I hadn't realized burnt bulbs ran so much hotter than clean bulbs. Big difference between 65'F and 113'F

#3 3 years ago

MDF

frenchmarky

Pinside member

Moreno Valley, CA

5y 79,800 3,108 7 30

You know the really black ones get hot when you grab one with your bare fingers for sure! It's actually enjoyable throwing those in the trash can.

#4 3 years ago

KOJ

koji

Pinside member

Surrey, BC

6y 112K 2,648 14 64

Quoted from ForceFlow:
Interesting--I hadn't realized burnt bulbs ran so much hotter than clean bulbs. Big difference between 65'F and 113'F

Thank you, yeah, people seem to consider the 44s as killers, but from what I saw, it was not too much hotter than the 47. I expected more of a difference... (even given some variance due to materials etc.)

#5 3 years ago

???

JethroP

Pinside+ Frequent

6y 101K 3,120 9 14 1

Very interesting. Thanks for sharing.

#6 3 years ago

237

slochar

Pinside member

7y 86,550 6,854

Can you do an LED retro type which presumably has less LEDs on it than the bright version?

#7 3 years ago

MDF

frenchmarky

Pinside member

Moreno Valley, CA

5y 79,800 3,108 7 30

Quoted from slochar:
Can you do an LED retro type which presumably has less LEDs on it than the bright version?

One of the least bright ones equal to a #47 probably wouldn't read much different than an empty socket.

#8 3 years ago

ABC

Crash

Pinside member

12y 141K 14,126

Interesting! I thought it was just a hunch I had when removing blackened bulbs vs. good unburned bulbs. It definitely felt like the blackened ones have been running hotter, and I'm glad someone was able to confirm that. But those temperature differences are pretty extreme. I think there are two reasons for this. One, the filament is degraded in these high runtime bulbs causing more resistance and more heat. Two, the tungsten particles on the inside of the glass itself block the visible and infrared light from escaping effectively, causing the radiation to be reflected back to the inside of the bulbs. This results in a kind of greenhouse effect like what you get when you leave your car windows rolled up in the summer.

#9 3 years ago

KOJ

koji

Pinside member

Surrey, BC

6y 112K 2,648 14 64

Quoted from Crash:
Interesting! I thought it was just a hunch I had when removing blackened bulbs vs. good unburned bulbs. It definitely felt like the blackened ones have been running hotter, and I'm glad someone was able to confirm that. But those temperature differences are pretty extreme. I think there are two reasons for this. One, the filament is degraded in these high runtime bulbs causing more resistance and more heat. Two, the tungsten particles on the inside of the glass itself block the visible and infrared light from escaping effectively, causing the radiation to be reflected back to the inside of the bulbs. This results in a kind of greenhouse effect like what you get when you leave your car windows rolled up in the summer.

Yeah, that makes sense to me. I just got tired of the witch hunt on incadescents. I like my LEDs, but I also appreciate that it is fine to run clean incandescents.. If maintained properly, they should not damage anything.... and I'd imagine in home use, this would take a fair amount of time (generally), for them to reach this stage of burn (if they survive long enough).

#10 3 years ago

KOJ

koji

Pinside member

Surrey, BC

6y 112K 2,648 14 64

Quoted from frenchmarky:
One of the least bright ones equal to a #47 probably wouldn't read much different than an empty socket.

Yeah, IIRC, they are running about 80% or so more efficiently, so ~20% of the heat?

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