e-watt LED light bulbs - what has been your experience

FIRST General Forum
#51

I have way less of an understanding of how incandescents work so I cannot speak to them as well as LED, but how do you tune the CCT of an incandescent bulb? Just curious, it seems like a pretty interesting thing to do.

Lighting is all about “feel” as you have said. Unfortunately its extremely difficult to put measurable metrics on feel, which is why lighting is sometimes a very tough market to penetrate. As you said, options must be available for users to make their own choices of what feels right to them.

I do have to say however, since I began working on LED lighting around 3 and a half years ago, I now prefer cooler feel temperatures (higher CCT). Nothing in the 4500K+ range, but a 2700K temp actually feels wrong to me now.

-Brando

#52

The user can change the color temperature of an incandescent bulb by dimming it.

The manufacturer makes long-life incandescents by changing the filament slightly so it doesn’t burn as hot. That gives a yellower light, and the filament lasts longer. And the bulb is less efficient (fewer lumens per watt).

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#53

Reported

#54

What kind of watt meter would you use?
What brand? Where would you purchase it?

#55

Our display has places for 4 bulbs so we can compare the color and directionality of the bulbs. Maybe we should get incandescent bulbs with the warm and cool designations to use in the display.

Karen - I can’t tell the difference in your photo. You may have found the perfect application for a 40 watt LED that looks like 60 Watt in one direction!

When I next see our display and /or the builder of it, I’ll get the details on the watt meter. All I remember it that it plugged into the outlet and had a digital read-out!

#56

Budget-conscious consumer electronics vendor Vizio is getting in on the act… reported here: http://www.engadget.com/2011/06/22/vizio-your-favorite-low-cost-tv-leader-introduces-a-light-bu/

“…A Vizio price…”

#57

Well, I got my first bulb yesterday, and boy are they directional. I have a standard lamp in the living room, and the LED bulb does not cast enough light downwards to read by - while a 60W incandescent is almost too bright.

On the other hand, in a downward-facing ceiling fixture, they are excellent.

Thank you PaW for the Vizio link; using a cheap bathroom light bar as my demonstration board will save me a bit of grief.

As for wattmeters: I am planning to get four $3 Harbor Freight digital multimeters, connect them to show Amperes for each of the four bulbs I want to display (LED, CFL, 40 or 60w Incandescent, 45 or 65W R30). People will see bigger numbers for the Incandescents, that’ll be all they need. Done, & done.

#58

I wish I could try one in our table lamp. However, we generally use a 150-watt 3-way bulb, so trying any 40-60-watt bulb replacement would not be a fair test!

#59

For a user friendly meter you could also use something like this for $21.

Kill-a-watt.jpg


Kill-a-watt.jpg

#60

I would watch out for those meters. I looked at some of the reviews and a lot of them said the meters were prone to breaking. And trying to show a potential costumer watts with a broken meter may not help you sell this product.

#61

That’s odd. The customer ratings heavily favored it with only 6% out of ~700 people rating it who disliked it.

I suppose it also depends on how much it gets banged around.
Cost comes into play too. A professional grade meter will cost more than one for casual home use.

#62

I use Kill A Watt meters often in my lab, in situations that do not require either (1) accurate data with traceable calibration, or (2) data sampling at a relatively high rate, such as might be required when we observe repetitive or pulsating load conditions. Most electric lighting tests satisfy both of the conditions above. (For tests that do not, we use much more expensive power metering equipment.)

We have not experienced failure of Kill A Watt in our tests. I would certainly use one for demonstrating e-watt light bulb power use.

#63

We just received a box of the led lights and man are they nice. There brighter than the 60 watt cfl bulbs I have, and they look cool. I thing this will be an amazing fundraiser for our team.

#64

We have sold a full case, and recouped a profit of 235ish dollars. The reason it is less is that we couldn’t get any purchases with 20 dollars, so we lowered it to 15, with 3 for 40.

#65

We are beginning to heavily get into selling these bulbs. I’m curious as to other teams experiences, and if they saw something similar to the above quoted text.

I’m wondering if it’s necessary to make $13/bulb (@$20 MSRP) on these when you could really get the volumes up while selling in the $15 range.

-Brando

#66

I have heard of selling light bulbs as a fundraiser. Where do people typically buy the bulbs from? I heard that you can buy them for $7.50 and charge $15 as a fundraiser. Is this something you can do through FIRST or do teams just do it on their own?

#67

It’s through FIRST. Dean talked about it at Kickoff, before the game was revealed (and it’s been going on for a year or two now).

Try http://www.usfirst.org/roboticsprograms/first-green-e-watt-saver-resources for more info (and I had a tough time finding it…)

#68

FIRST has an LED light bulb fundraiser
http://www.usfirst.org/aboutus/first-green-a-modern-day-twist-on-team-fundraising-methods

#69

My team, team 358 is looking for another fundraiser, to replace our main fundraiser we cant do anymore. I was wondering how much it cost to buy the light bulbs and how much you guys sell them for. Also how successful are you in selling and making profit with them? Thanks

Team 358

#70