Convoy C8+ getting hot

22 posts / 0 new
Last post
QMT93
Offline
Last seen: 3 hours 35 sec ago
Joined: 06/04/2019 - 03:31
Posts: 115
Convoy C8+ getting hot

Hi,

I set my C8+ on 100% only, and within a few minutes, the body became unbearably hot. The output doesn’t seem to drop, to my eyes, which is a good thing.

Is this one of the major disadvantages when having too much output in a small body? What about larger lights, e.g. Convoy L2, L6, does the heat dissipate better, and it takes longer for the heat to travel down the light body to bother the user, if at all?

I guess all of the reading didn’t give me this basic insight, until I actually use the light, and have my own opinion.

Marc E
Offline
Last seen: 7 hours 1 min ago
Joined: 05/18/2013 - 08:14
Posts: 238
Location: South West UK

You want the heat to transfer away from the LED and into the body as quickly as possible, slowing that transfer down might keep your hand cool but allows the LED to heat up very quickly causing performance issues.
Once in the body the heat dissipates into the air, and the more surface area there is the better the heat can dissipate, so larger lights are about having more surface area in contact with the cooler air, not about providing a longer pathway to slow down heat transfer away from the LED.
So having your C8+ heat up very quickly is good from a heat management point of view but from not from a comfortable hand point of view because as you correctly summise, this is a major disadvantage of having high output in a small body which makes it a major limiting factor.

The fins you see on torches are a way of increasing this surface area contact while keeping overall added size to a minimum. (Brain’s a bit ‘meh’ at the mo so can’t think how to explain that better.)

Lightbringer
Lightbringer's picture
Offline
Last seen: 4 hours 33 min ago
Joined: 08/30/2016 - 14:12
Posts: 8890
Location: nyc

I’d stay away from any FW3As, too. LOL

09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0

QMT93
Offline
Last seen: 3 hours 35 sec ago
Joined: 06/04/2019 - 03:31
Posts: 115

Marc E and Lightbringer: Thanks guys! What is the maximum lux I can comfortably get out of the small body of the C8+, and what light should it be?

raccoon city
raccoon city's picture
Offline
Last seen: 2 hours 11 min ago
Joined: 10/06/2010 - 02:35
Posts: 12873
Location: रॅकून सिटी Palm Desert CA USA

Lightbringer wrote:

I’d stay away from any FW3As, too. LOL

Especially if they're 100% Turbo FW3A's!

(Otherwise, a regular FW3A would work fine.)

Lightbringer
Lightbringer's picture
Offline
Last seen: 4 hours 33 min ago
Joined: 08/30/2016 - 14:12
Posts: 8890
Location: nyc
QMT93 wrote:
Marc E and Lightbringer: Thanks guys! What is the maximum lux I can comfortably get out of the small body of the C8+, and what light should it be?

Depends on the temperature outside, your grip, buncha other factors.

As I learned from actual intentional hand-warmers, they can get comfy hot when left untouched, but then once you grab hold and sink away that nice heat, they seem to cool down rather quickly. Same with lights. Your hand (and blood-vessels, etc.) wick away heat which is quite unlike just leaving it tailstanding.

In scorching summer, not as much as a subzero winter.

Etc.

That’s why timed stepdowns are generally Frowned Upon here, vs active temperature control which steps down only only only when needed.

09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0

BlueSwordM
BlueSwordM's picture
Offline
Last seen: 19 min 33 sec ago
Joined: 11/29/2017 - 12:34
Posts: 4962
Location: Canada

Well, what version of the C8+ do you have?

Is it the SST-40 or XP-L HI?

My very own high current Beryllium Copper springs Gen 3:
http://budgetlightforum.com/node/67401
Liitokala Aliexpress Stores Battery Fraud: http://budgetlightforum.com/node/60547

QMT93
Offline
Last seen: 3 hours 35 sec ago
Joined: 06/04/2019 - 03:31
Posts: 115

@racoon city: I don’t have the FW3A, so I can’t tell, but I think it’s not as bright as the C8+ on max, which is why I didn’t choose it in the first place.

@Lightbringer: That makes sense. I was holding it, but I couldn’t do it for too long, as it got hotter and hotter.

@BlueSwordM: I have the XPl-HI. Is the SST-40 better?

BlueSwordM
BlueSwordM's picture
Offline
Last seen: 19 min 33 sec ago
Joined: 11/29/2017 - 12:34
Posts: 4962
Location: Canada

@QMT93, no. It’s actually worse in terms of heat since it consumes more power.

My very own high current Beryllium Copper springs Gen 3:
http://budgetlightforum.com/node/67401
Liitokala Aliexpress Stores Battery Fraud: http://budgetlightforum.com/node/60547

QMT93
Offline
Last seen: 3 hours 35 sec ago
Joined: 06/04/2019 - 03:31
Posts: 115

Lucky me, I guess!

BurningPlayd0h
BurningPlayd0h's picture
Offline
Last seen: 7 hours 53 min ago
Joined: 06/22/2018 - 02:16
Posts: 628
Location: MN
QMT93 wrote:
@racoon city: I don’t have the FW3A, so I can’t tell, but I think it’s not as bright as the C8+ on max, which is why I didn’t choose it in the first place.

It has nearly 3x the output with the same X-PL HI emitters. Lumens is total light output and candela is how intense/focused a light is. The C8 has much higher candela due to being a single emitter in a large reflector vs three emitters behind tiny optics in the FW3A.

QMT93
Offline
Last seen: 3 hours 35 sec ago
Joined: 06/04/2019 - 03:31
Posts: 115

I just prefer higher cd/lux count, since it’s meant to be a pocket thrower. Its spill is decent, in my opinion, so I’d say it’s a high output throw.

mortuus
mortuus's picture
Offline
Last seen: 6 hours 23 min ago
Joined: 12/16/2014 - 09:33
Posts: 1971
Location: Sweden

weird, i have 2 c8+ and they dont get that hot… i mean the xpl hi does what 900 lumens only or so ? the s2+ tho gets hot since smaller size so worse heat transfers… but the c8 can handle highest mode long..

the sst20 version i can imagine gets hot quick since it does 2000 lumens or near that.. but i dont have that one.

the l6 is amazing if u want a light that size to shine 3000+lumens for a longer time, in the summer when it was 30c here my light heated up quickly but still u can run if a for a few min or longer depending how hot or cold it is where u live.

...where Frugal meets with Flashlight!

varbos
Online
Last seen: 9 min 55 sec ago
Joined: 02/16/2017 - 07:36
Posts: 381
Location: Europe

Were you holding it or leaving it unattended when it reached unbearable temperature?

QMT93
Offline
Last seen: 3 hours 35 sec ago
Joined: 06/04/2019 - 03:31
Posts: 115

mortuus: I'm not sure what's wrong with my lights, if any. varbos: I left it unattended at first, then wait for it to cool, then held it in my hand. In both cases, the light got hot at around the same time.

WalkIntoTheLight
Offline
Last seen: 2 hours 37 min ago
Joined: 12/05/2015 - 10:26
Posts: 1910
Location: Canada

Strange. The Convoy C8+ shouldn’t get too hot, at least not for many minutes. And if you’re holding it, it should maintain a temperature that is very holdable. I have a couple of Convoy C8’s and they don’t get hot at all, but they’re about 25% less bright than the C8+. My Astrolux C8 is brighter than the Convoy C8+, and even it doesn’t get that hot for several minutes (I have to keep boosting back to turbo every time it’s stupid timed stepdown happens).

If you turn on your light (to max) and set it down for awhile indoors (where there’s no wind), then I could see it would get hot eventually. I think the solution is to pick it up and use it normally.

varbos
Online
Last seen: 9 min 55 sec ago
Joined: 02/16/2017 - 07:36
Posts: 381
Location: Europe

When I am holding it in my hand (which acts as heatsink) my C8 Clear (7135×8 XPL-HI) will get pretty hot at the head/fins in 10-15 min. (at 100%)
But the body tube will not get “unbearably hot”. Just warm, no problem.

I would not expect C8+ with same emitter and driver to be significantly different. It sounds a little bit strange to me but there are many factors at play.

QMT93
Offline
Last seen: 3 hours 35 sec ago
Joined: 06/04/2019 - 03:31
Posts: 115

WalkIntoTheLight: I hold it in my hand, but it gets hot after a few minutes. varbos: I don’t know what to say. I guess I have a bad one.

WarHawk-AVG
WarHawk-AVG's picture
Offline
Last seen: 14 hours 51 min ago
Joined: 01/04/2014 - 06:47
Posts: 5065
Location: H-Town

Could be one of those thin C8 clones…usually the C8 has a solid shelf the emitter and star sit on..

Or it could be a short, can it turn off with the tail clicky?

QMT93
Offline
Last seen: 3 hours 35 sec ago
Joined: 06/04/2019 - 03:31
Posts: 115

I bought it from Fasttech. Is it a reputable reseller?

Turn off with the tail clicky? Can you elaborate? It’s a reverse clicky, so I have to press all the way to turn on or off.

WarHawk-AVG
WarHawk-AVG's picture
Offline
Last seen: 14 hours 51 min ago
Joined: 01/04/2014 - 06:47
Posts: 5065
Location: H-Town

If there is a short…when you screw it in…it comes on..clicky has no effect

Should be a good one…fasttech should ship good lights…

They should get warm but not so hot you can’t touch it

QMT93
Offline
Last seen: 3 hours 35 sec ago
Joined: 06/04/2019 - 03:31
Posts: 115

It doesn’t short, because I have to click it to turn it on or off.

I’ll do the test again.