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Search: Posts Made By: dougmc
Showing results 1 to 50 of 52
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Forum: Electronics, Lighting, & Gadgets
07-04-15, 11:09 PM
Replies: 928
Views: 359,512
Posted By dougmc

That light is shipped with a 2s battery -- so it...

That light is shipped with a 2s battery -- so it maxes out at 8.4 volts. In general, those lights will work fine on a 3s battery (though this is not 100% certain), so 12.6 volts, and a car system...
Forum: Electronics, Lighting, & Gadgets
10-31-14, 09:33 AM
Replies: 928
Views: 359,512
Posted By dougmc

After seeing the $15 one, I ordered another. It...

After seeing the $15 one, I ordered another. It arrived yesterday ... which had it arriving in two weeks.

Things I've ordered from China in the last year or so are getting here more quickly...
Forum: Electronics, Lighting, & Gadgets
10-16-14, 11:21 AM
Replies: 928
Views: 359,512
Posted By dougmc

Well, except that the title was "Black Solarstorm...

Well, except that the title was "Black Solarstorm 5000LM 2X CREE XML U2 LED Front Bicycle Bike Headlight Headlamp | eBay...
Forum: Electronics, Lighting, & Gadgets
05-22-14, 08:58 AM
Replies: 928
Views: 359,512
Posted By dougmc

5000 lumens? Somehow, I doubt that. That would...

5000 lumens? Somehow, I doubt that. That would consume about 50 watts of power (assuming a good LED) (so it would get very hot, even on a moving bicycle) and would have it putting out more light...
Forum: Electronics, Lighting, & Gadgets
04-23-14, 06:51 PM
Replies: 928
Views: 359,512
Posted By dougmc

That comment you replied to is almost six years...

That comment you replied to is almost six years old, and things have changed. Now it's quite easy to get a bike specific light that puts out a lot of light for under $50. In fact, you can get three...
Forum: Electronics, Lighting, & Gadgets
01-20-14, 10:35 PM
Replies: 928
Views: 359,512
Posted By dougmc

Your light must be more efficient than the single...

Your light must be more efficient than the single cell 18650 lights I've got -- they put out around 400 mAh lumens real world and last about an hour at full brightness with 2400 mAh (real world -- I...
Forum: Electronics, Lighting, & Gadgets
12-11-13, 12:22 AM
Replies: 928
Views: 359,512
Posted By dougmc

Call it spotty quality, but this light from...

Call it spotty quality, but this light from Amazon (http://www.amazon.com/gp/product/B006QQX3C4/) is the absolute < $50 value winner right now. (If your budget is $50, you can afford two!)

The...
Forum: Electronics, Lighting, & Gadgets
10-11-13, 04:58 PM
Replies: 928
Views: 359,512
Posted By dougmc

Normally the lights have pre-made packs rather...

Normally the lights have pre-made packs rather than four loose 18650 cells to put into a holder. I've never seen such a holder, though maybe they do exist somewhere.

nery's point is that these...
Forum: Electronics, Lighting, & Gadgets
09-29-13, 10:19 PM
Replies: 928
Views: 359,512
Posted By dougmc

There is no consistent exaggeration factor --...

There is no consistent exaggeration factor -- you'll just need to look up the specific light and see what people say.

Note that I've gotten their basic 18650 batteries ($8 for two) and I think...
Forum: Electronics, Lighting, & Gadgets
08-22-13, 03:28 PM
Replies: 928
Views: 359,512
Posted By dougmc

I own both this light and the diffuser. I've...

I own both this light and the diffuser. I've tried the diffuser and just don't care for it. I might use it if I used two of these lights, however -- one with and one without. But certainly, it's a...
Forum: Electronics, Lighting, & Gadgets
08-18-13, 08:58 PM
Replies: 928
Views: 359,512
Posted By dougmc

Actually, I wouldn't think. 1) "brightness"...

Actually, I wouldn't think.

1) "brightness" is a very subjective thing. Doubling the number of lumens or lux doesn't make the light seem "twice as bright", and

2) just because the light uses...
Forum: Electronics, Lighting, & Gadgets
01-07-13, 05:40 PM
Replies: 928
Views: 359,512
Posted By dougmc

That's nothing a sandwich bag and some packing...

That's nothing a sandwich bag and some packing tape won't fix.

The battery looks like four cells in some shrinkwrap, and they give you a little cloth case with velcro on it that holds it to a stem...
Forum: Electronics, Lighting, & Gadgets
10-29-12, 12:51 PM
Replies: 928
Views: 359,512
Posted By dougmc

The traffic laws specify a maximum permitted...

The traffic laws specify a maximum permitted speed, yes, but you can't assume that just because you are going under this speed that you are "prepared to react as defined by the traffic laws". It's...
Forum: Electronics, Lighting, & Gadgets
09-16-12, 10:30 PM
Replies: 928
Views: 359,512
Posted By dougmc

A CREE Q5 puts out about 240 lumens at 1 amp, so...

A CREE Q5 puts out about 240 lumens at 1 amp, so with AAA NiMH cells which are typically around 700 mAh you'd get about 45 minutes of full brightness, or somewhat longer if the brightness goes down...
Forum: Electronics, Lighting, & Gadgets
12-29-11, 12:19 AM
Replies: 928
Views: 359,512
Posted By dougmc

Hmm. Could the battery pack on these new lights...

Hmm. Could the battery pack on these new lights be 1s2p rather than 2s1p? That would make them more like the 18650 flashlights we're fond of. That would explain why the plugs are different -- the...
Forum: Electronics, Lighting, & Gadgets
12-27-11, 02:35 PM
Replies: 928
Views: 359,512
Posted By dougmc

lopek77 did say that the eBay version had a newer...

lopek77 did say that the eBay version had a newer emitter. Now, I don't know how much of an improvement that makes, but if it's more efficient that could make having a smaller power pack OK. I'd...
Forum: Electronics, Lighting, & Gadgets
12-21-11, 12:24 PM
Replies: 928
Views: 359,512
Posted By dougmc

The Magicshines and clones don't have this...

The Magicshines and clones don't have this problem.

You can alleviate this problem to a large degree with your flashlight by using some paper to make a sleeve for the battery so it can't rattle...
Forum: Electronics, Lighting, & Gadgets
12-14-11, 10:53 AM
Replies: 928
Views: 359,512
Posted By dougmc

Unfortunately, cameras adjust for the light, so...

Unfortunately, cameras adjust for the light, so if you really want to show the differences between two different lights (or more to the point, modes of the same light) you need to have both going on...
Forum: Electronics, Lighting, & Gadgets
11-25-11, 02:34 AM
Replies: 928
Views: 359,512
Posted By dougmc

For the record, it's convenient to have a "dumb"...

For the record, it's convenient to have a "dumb" charger of some sort in addition to the Maha, because it can't really revive dead (totally discharged) cells.

The Maha will refuse to charge any...
Forum: Electronics, Lighting, & Gadgets
11-24-11, 01:29 AM
Replies: 928
Views: 359,512
Posted By dougmc

In high discharge situations (say over 1 A for...

In high discharge situations (say over 1 A for AAs), their voltages will typically be higher than that of alkalines rather than lower.

The self discharge is indeed a pretty big problem. I'm not...
Forum: Electronics, Lighting, & Gadgets
11-21-11, 01:40 PM
Replies: 928
Views: 359,512
Posted By dougmc

OK, given that eneloops work significantly better...

OK, given that eneloops work significantly better the first time (longer life, more light during that life) and cost 6x as much as cheap alkalines (a 4 pack of eneloops costs $10, with a 4 pack of...
Forum: Electronics, Lighting, & Gadgets
11-20-11, 03:05 PM
Replies: 928
Views: 359,512
Posted By dougmc

Nice. Looks like this particular light (Fenix...

Nice. Looks like this particular light (Fenix L2D CE) uses two AA cells and is rated at 135, 80, 40 and 9 lumens -- so it looks like the Y axis is lux, not lumens. (Not that this changes the graphs...
Forum: Electronics, Lighting, & Gadgets
11-20-11, 01:54 PM
Replies: 928
Views: 359,512
Posted By dougmc

Yes, the discharge curves I gave showed similar...

Yes, the discharge curves I gave showed similar results. (Are you replying to me or to Kingshead?)

But as for the alkaline vs. NiMH (eneloop or not) argument, note that alkalines drop even faster...
Forum: Electronics, Lighting, & Gadgets
11-20-11, 12:31 PM
Replies: 928
Views: 359,512
Posted By dougmc

I read your anecdote, but noted that it was...

I read your anecdote, but noted that it was totally contrary to my own experience with many different motorized devices, with rehargeables performing far better (and being far cheaper) than...
Forum: Electronics, Lighting, & Gadgets
11-20-11, 01:23 AM
Replies: 928
Views: 359,512
Posted By dougmc

You seem to have some misconceptions about...

You seem to have some misconceptions about rechargeable batteries.

NiMH and NiCd cells start at about 1.4 volts and go down from there. 1.2 volts is the "nominal" voltage given for them, but they...
Forum: Electronics, Lighting, & Gadgets
11-04-11, 08:24 AM
Replies: 928
Views: 359,512
Posted By dougmc

Just for the record, I'm aware that lithium...

Just for the record, I'm aware that lithium batteries have exploded. I've been flying R/C planes for longer than seriously riding bicycles and that's the hobby that has really had the brunt of it...
Forum: Electronics, Lighting, & Gadgets
11-03-11, 08:47 PM
Replies: 928
Views: 359,512
Posted By dougmc

Link to this thread? It may have happened,...

Link to this thread?

It may have happened, but I doubt it's happened to *many*. And note that alkaline batteries can be easily turned into "hot steamers" too.

The $4 ones I've referred to are...
Forum: Electronics, Lighting, & Gadgets
11-03-11, 03:12 PM
Replies: 928
Views: 359,512
Posted By dougmc

Assuming 1200 mAh AAA cells with an average...

Assuming 1200 mAh AAA cells with an average voltage of 1.3 volts (probably on the high side) -- three of them can put out 5 watts for 56 minutes.

Alkaline batteries have vent holes too. They're...
Forum: Electronics, Lighting, & Gadgets
11-03-11, 10:19 AM
Replies: 928
Views: 359,512
Posted By dougmc

For buying new sets out on the road, yes, AAA...

For buying new sets out on the road, yes, AAA wins (really, AA wins even more, but you've chosen lights that only take AAAs). But beyond that ...

1 18650 battery is approximately the same size as...
Forum: Electronics, Lighting, & Gadgets
11-02-11, 03:06 PM
Replies: 928
Views: 359,512
Posted By dougmc

The Ebay listing given doesn't say that the...

The Ebay listing given doesn't say that the lights work with AAAs, though I have seen 18650 lights that come with an adapter that make them work with 3xAAA lights (and a sleeve to make an 18650...
Forum: Electronics, Lighting, & Gadgets
06-11-11, 03:25 PM
Replies: 928
Views: 359,512
Posted By dougmc

I was intrigued by the Romisen you mentioned, so...

I was intrigued by the Romisen you mentioned, so I bought it. It just arrived today (I ordered it 5/22 -- DX was fast!)

I like the beam pattern -- it has a lens and the focus is adjustable, and...
Forum: Electronics, Lighting, & Gadgets
05-22-11, 11:26 AM
Replies: 928
Views: 359,512
Posted By dougmc

The Romisen you're ordering says it'll take 18650...

The Romisen you're ordering says it'll take 18650 batteries -- probably it has an adapter of some sort to make it work. Using these would be better than anything involving AAA's.

Walmart doesn't...
Forum: Electronics, Lighting, & Gadgets
05-21-11, 11:12 PM
Replies: 928
Views: 359,512
Posted By dougmc

As long as the light is the proper size for the...

As long as the light is the proper size for the mount, it's perfect. (And most of the 18650 lights are.)

It's very simple -- nothing to go wrong. Just buy it and try it.

In all regards? I'm...
Forum: Electronics, Lighting, & Gadgets
05-16-11, 10:09 AM
Replies: 928
Views: 359,512
Posted By dougmc

Are you sure of this? I've never had a problem...

Are you sure of this? I've never had a problem with my P7 lights, even on high. Not when mounted on bike, anyways.

I've had them get hot when I used them as a flashlight -- but on a bike...
Forum: Electronics, Lighting, & Gadgets
05-07-11, 09:55 AM
Replies: 928
Views: 359,512
Posted By dougmc

Eneloops aren't "beefy". Their mAh ratings are...

Eneloops aren't "beefy". Their mAh ratings are mediocre -- 2000 mAh when batteries claiming 3200 mAh are available. (Note that the really high mAh rated batteries tend to suck in other ways, even...
Forum: Electronics, Lighting, & Gadgets
03-22-11, 09:29 AM
Replies: 928
Views: 359,512
Posted By dougmc

It's not 500 lumens. The one watt version is...

It's not 500 lumens. The one watt version is around 50 lumens, so I'd expect the two watt version to be around 100 lumens.

The P7 flashlights are around 400 lumens on high. This one...
Forum: Electronics, Lighting, & Gadgets
03-17-11, 01:08 PM
Replies: 928
Views: 359,512
Posted By dougmc

i.e. circuitry? Your trust is misguided. ...

i.e. circuitry? Your trust is misguided.

Your laptop explicitly has a circuitry to look at every cell and refuse to overcharge any particular one. Your cell phone only has one cell and therefore...
Forum: Electronics, Lighting, & Gadgets
11-24-10, 01:41 PM
Replies: 928
Views: 359,512
Posted By dougmc

Well, they have a lot of similar variations on...

Well, they have a lot of similar variations on the P7 lights. That particular one was

MTE SSC P7 900-Lumen 5-Mode Super LED Flashlight (18650)

though now that I look through my list of...
Forum: Electronics, Lighting, & Gadgets
10-06-10, 08:10 PM
Replies: 928
Views: 359,512
Posted By dougmc

Do you have the exact same blinkie I suggested? ...

Do you have the exact same blinkie I suggested? Some of the other DX lights are crap (as I already mentioned) but this one is pretty good. It's similar to the Planet Bike Superflash, but slightly...
Forum: Electronics, Lighting, & Gadgets
10-06-10, 02:37 PM
Replies: 928
Views: 359,512
Posted By dougmc

Well, what's your budget? Taillights -- ...

Well, what's your budget?

Taillights --

http://www.dealextreme.com/details.dx/sku.35036 $3.54 taillight, good quality, great price. Really, at this price, as good as this light is, I'm hard...
Forum: Electronics, Lighting, & Gadgets
09-18-10, 09:13 PM
Replies: 928
Views: 359,512
Posted By dougmc

There's nothing wrong with adapting non-bike...

There's nothing wrong with adapting non-bike lights for bike use ... but that wouldn't make a very good headlight. It doesn't create a beam -- it just lights up the general area.

You could mount...
Forum: Electronics, Lighting, & Gadgets
09-16-10, 09:50 AM
Replies: 928
Views: 359,512
Posted By dougmc

If it's one of those generators that looks like a...

If it's one of those generators that looks like a coke bottle and rubs the side of the tire and has an incandescent light (at least that's what I think of that goes with "old schwinn") then the only...
Forum: Electronics, Lighting, & Gadgets
08-20-10, 12:22 PM
Replies: 928
Views: 359,512
Posted By dougmc

OK, but the DealExtreme lights don't really let...

OK, but the DealExtreme lights don't really let you pick your beam width. In general, most of their 18650 lights have the same reflector and similar emitters and therefore the same beam, and I'm not...
Forum: Electronics, Lighting, & Gadgets
08-13-10, 04:38 PM
Replies: 928
Views: 359,512
Posted By dougmc

They are better than what you'll find at Walmart....

They are better than what you'll find at Walmart.

Both are excellent bicycle lights. The Superflash is hard to beat without spending a lot more money, though there are some cheaper lights that...
Forum: Electronics, Lighting, & Gadgets
04-16-10, 01:24 PM
Replies: 928
Views: 359,512
Posted By dougmc

Buy it now: $10.87 Shipping: $13.83 Total:...

Buy it now: $10.87
Shipping: $13.83
Total: $24.70

... not such a great deal. You can find it online at reputable dealers for about $19. And if you want, print out the page of one...
Forum: Electronics, Lighting, & Gadgets
04-05-10, 01:48 PM
Replies: 928
Views: 359,512
Posted By dougmc

Pretty easily ... ...

Pretty easily ...

http://www.dealextreme.com/details.dx/sku.12060 $28.04 light
http://www.dealextreme.com/details.dx/sku.8274 $1.80 mount
http://www.dealextreme.com/details.dx/sku.5790 $8.10 two...
Forum: Electronics, Lighting, & Gadgets
12-10-09, 11:58 AM
Replies: 928
Views: 359,512
Posted By dougmc

If you're on an extremely tight budget, this...

If you're on an extremely tight budget, this light -- http://www.dealextreme.com/details.dx/sku.18307 -- is remarkably good for $7.43. Unlike most of DE's dedicated bike lights, this light is...
Forum: Electronics, Lighting, & Gadgets
10-15-09, 02:15 PM
Replies: 928
Views: 359,512
Posted By dougmc

No, it works great. I regularly take my...

No, it works great.

I regularly take my light off the mount -- I just pull it straight up and it comes right out -- no need to take anything apart. And it's held in strongly enough that it's...
Forum: Electronics, Lighting, & Gadgets
10-09-09, 11:24 AM
Replies: 928
Views: 359,512
Posted By dougmc

Part of the problem is that people don't agree. ...

Part of the problem is that people don't agree. And when you're arguing about why yours is better, the buzzwords tend to come out.

But my advice?
...
Forum: Electronics, Lighting, & Gadgets
04-27-09, 11:07 AM
Replies: 928
Views: 359,512
Posted By dougmc

I've bought several of the lights from...

I've bought several of the lights from DealExtreme. For the most part, they're OK -- low cost but low quality. This one (http://www.dealextreme.com/details.dx/sku.18307) in particular is probably...
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