Timeline for Can I safely use a 9w LED bulb in place of a 40w incandescent?
Current License: CC BY-SA 3.0
13 events
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| S Mar 16, 2016 at 15:15 | history | edited | Niall C.♦ | CC BY-SA 3.0 |
Fix the rest of it
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| S Mar 16, 2016 at 15:15 | history | suggested | Sam | CC BY-SA 3.0 |
fixing bad typing
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| Mar 16, 2016 at 15:04 | comment | added | Sam | Let us continue this discussion in chat. | |
| Mar 16, 2016 at 15:02 | comment | added | Sam | I'm not going to explain all of electrical engineering to you or basic physics. If you need a current limiting resistor, you are using the wrong SMPS. Led's should be driven by a current source. "Quantum emission" has literally nothing to do with it. Led's become vastly less efficient when driven at or near max power, since cree's "thing" is "max brightness" they drive their LEDs near max power which is less efficient. | |
| Mar 16, 2016 at 14:56 | comment | added | SkipBerne | ... then explain why my 400 watts of light is cool to the touch with the phillps flats and the Crees are burning hot. of the '9 watts' consumed how much of that is converted to light and ir? Q?: can you use an LED without a current limiting resistor? A: yes. in that fashion all the power that is dissipated is quantum emission. | |
| Mar 16, 2016 at 14:50 | review | Suggested edits | |||
| S Mar 16, 2016 at 15:15 | |||||
| Mar 16, 2016 at 14:47 | comment | added | Sam | "Phillip's yes the others and no doubt the chart's ... no." What? Seeing as I regularly talk to people who design SMPS (regulators in your laymen parlance) for satellites I think it's pretty safe to say I know what I'm talking about. | |
| Mar 16, 2016 at 14:42 | comment | added | SkipBerne | HPS vs LED cool to the touch. ... we have them in Cambridge MD. illuminating the city offices façade.. drive up, park, and touch. It is the only decision in 400 years that Cambridge got right. In fact they work better/ brighter . Its all in the regulators. Phillip's yes the others and no doubt the chart's ... no. | |
| Mar 16, 2016 at 14:18 | comment | added | Sam | The bulb itself is not 96-98% efficient, the SMPS might be but even that is a stretch. In terms of energy output by LED's as light vs heat that chart is correct. You find a LED that outputs the same light as a high pressure sodium or vice versa I'll take your bet. | |
| Mar 16, 2016 at 13:11 | comment | added | SkipBerne | the table is bogus ... it shows that a high pressure sodium lamp is more efficient than an LED. You hold that and I will hold the LED. see who lets go first. LEDs require power supplies. Phillips flat bulbs don't. my 75 watt bulbs are only warm to the touch. Crees will burn you because they use an inefficient regulator. I use AAs to power my sail boats LED navigational lighting array, replacing a car battery that could barely run 1 night. | |
| Mar 16, 2016 at 11:10 | comment | added | marcelm | LEDs are nowhere near that efficiency. Wikipedia has a nice table showing the luminous efficacy of various light sources. As you can see, a bare white led has a maximum effiency of 22%, and complete LED lighting fixtures are generally around 10% efficient. This is better than the ~2% of incandescents, but miles away from your claim. | |
| Mar 15, 2016 at 16:29 | history | edited | SkipBerne | CC BY-SA 3.0 |
added 21 characters in body
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| Mar 15, 2016 at 16:24 | history | answered | SkipBerne | CC BY-SA 3.0 |