Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post

Stubby79 · 01-31-2018, 06:39 AM

I pulled the bulb off of one of mine (Luminus brand from Costco, not Fiet).

Still works:

Meaning there's no phosphorescent lining to the inside of the bulb, as I was starting to wonder. I can't see there being enough phosphor on top of those tiny chips, either (but correct me if I'm wrong).

Longevity seems ok, in spite of not having a huge heat sink. I've had to replace 1 that I know of in the past ~2 years, on lights that stay on 24/7. Not completely conclusive, but at least comparable to CFLs, which always seem to croak after a couple of years.

I'll re-purpose this bulb. 800 lumens at 9.5 watts (though double that volt-amp wise) for a couple of bucks? Drool!

Edit: They may very well have a phosphor lining built in to each LED...when you cut the power, the LEDs fade to nothing over a half a second or so. (or does the power supply have a capacitor that takes a moment to discharge?) Might explain the yellow you see on modern LEDs? (they used to all be clear just a few years back). Then again, I have red and yellow LED bulbs that are yellow on top.

Welp, I'm now thoroughly confused. Someone enlighten me!

Edit: it inst a persistent glow, like a CFL...I'm going with capacitor discharge.

01-31-2018, 06:39 AM	#25 (permalink)
Stubby79 Master EcoModder Join Date: Sep 2012 Location: Victoria, BC Posts: 1,747 Firefly EV - '98 Pontiac Firefly EV 90 day: 107.65 mpg (US) Little Boy Blue - '05 Toyota Echo 90 day: 33.35 mpg (US) BlueZ - '19 Nissan 370Z Sport 90 day: 17.19 mpg (US) Thanks: 75 Thanked 576 Times in 426 Posts	I pulled the bulb off of one of mine (Luminus brand from Costco, not Fiet). Still works: Meaning there's no phosphorescent lining to the inside of the bulb, as I was starting to wonder. I can't see there being enough phosphor on top of those tiny chips, either (but correct me if I'm wrong). Longevity seems ok, in spite of not having a huge heat sink. I've had to replace 1 that I know of in the past ~2 years, on lights that stay on 24/7. Not completely conclusive, but at least comparable to CFLs, which always seem to croak after a couple of years. I'll re-purpose this bulb. 800 lumens at 9.5 watts (though double that volt-amp wise) for a couple of bucks? Drool! Edit: They may very well have a phosphor lining built in to each LED...when you cut the power, the LEDs fade to nothing over a half a second or so. (or does the power supply have a capacitor that takes a moment to discharge?) Might explain the yellow you see on modern LEDs? (they used to all be clear just a few years back). Then again, I have red and yellow LED bulbs that are yellow on top. Welp, I'm now thoroughly confused. Someone enlighten me! Edit: it inst a persistent glow, like a CFL...I'm going with capacitor discharge. Attached Thumbnails Last edited by Stubby79; 01-31-2018 at 11:43 AM..