lumens per watt Archives - The Silicon Underground

Philips’ new LED bulbs are cheap but have caveats

Dave Farquhar — Mon, 27 Apr 2015 11:00:21 +0000

Later this week, Philips will be releasing a new, cheap LED bulb at an introductory rate of $5 for a pack of two. They are 800 lumen bulbs, equivalent to a 60w incandescent in light output, use 8.5 watts to give

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Home Depot’s Ecosmart 40w replacement is a good $5 LED bulb

Dave Farquhar — Thu, 19 Mar 2015 11:00:45 +0000

So I took the plunge and bought a package of the Ecosmart 40w equivalent soft white LED bulbs last week. As long as you’re aware that it’s not dimmable–let me repeat that, it’s not dimmable–it’s a really good bulb, especially

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Compact fluorescent life expectancy

Dave Farquhar — Sun, 21 Sep 2014 11:00:17 +0000

There’s a lot of talk about compact fluorescent life expectancy. I actually tracked my CFL lifespan. Here’s what I found. I noticed this week that a compact fluorescent bulb in the kitchen had burned out, so this week I bought an

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Cree releases a $20 100W-equivalent LED bulb–but do you want one?

Dave Farquhar — Thu, 13 Mar 2014 11:00:14 +0000

Cree joined Phillips in offering an LED bulb in the 1600-lumen class, suitable for replacing 100W incandescents. The Cree bulb costs $5 less than the Phillips competitor, in unsubsidized markets. (Many utilities subsidize energy efficient bulbs because it’s cheaper than

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Another month, another go-to LED bulb

Dave Farquhar — Tue, 28 May 2013 11:00:29 +0000

LED lighting seems to change constantly. I read about Cree’s LED bulbs a good 12-18 months ago and they sounded too good to be true. In a way, they were, because you couldn’t buy them anywhere. The wait is finally

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Early impressions of G7’s 900-lumen 9W LED bulb

Dave Farquhar — Sat, 10 Nov 2012 17:02:19 +0000

My latest lighting experiment is a 900-lumen bulb from G7, which is rated at 9 watts and priced at around $16. It’s advertised as equivalent to a 65W incandescent. I’ve had two of them for about two months now, and

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The lightbulb reinvented

Dave Farquhar — Wed, 19 Sep 2012 22:10:13 +0000

Timothy Hunt asked me (via Twitter) if I’ve seen the lightbulb reinvented, an LED bulb that screws into a standard socket but has wi-fi capability so you can tune its light temperature and otherwise control it with a smartphone. I

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When to upgrade to new LED bulbs

Dave Farquhar — Mon, 23 Apr 2012 00:59:37 +0000

PC Magazine asks when it’s worth upgrading to the new Philips L Prize-winning LED bulb, lamenting its high price and long payback time. I can only say what I plan to do, based on my experience with high-efficiency bulbs. I

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I got an LED bulb, and it is fabulous.

Dave Farquhar — Sun, 26 Sep 2010 22:02:21 +0000

I half-heartedly checked Home Depot's web site today, and saw they had 429-lumen, 8.6-watt (40W equivalent) LED bulbs at my local store. Finally!

So when I had a chance, I drove over, plunked down my 19 bucks, and brought one home.

It's not perfect. But I like it an awful lot.

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