Random 10W floodlight Comparison just for kicks

[Weasel]

So i kind of posted on this already but decided to report properly, both are china made one is about R150 Grey one marked only as TF brand while the other is around R250 Black one.which is a renesola

So first the power supplies, The TF had one major concern which was the earth not being connected inside the case but from what i've seen this is quite common in the cheapest tier lights still not good at all. The supply itself is potted and sealed no problem but horribly inefficient. The Renesola is a more discrete design seems fairly good on efficiency and breaks no rules. I measured the consumption of both supplies to be roughly the same 12W but the TF was only supplying 4.3W to the LED while the Renesola was doing 9.3W 

The light output I measured put the renesola at 6.43 points while the TF scored 4.14, a little disappointing but not surprising considering the amount of power supplied to it. The picture shows them under the same exposure also revealing a more even beam  than the TF. The leds themselves are quite different, TF's forward voltage is around 10V while the rene is around 70V the rene's is bigger so probably will last longer from a thermal perspective, that is if they where to recieve equal amounts of power, which they don't.

The thermals show the renesola to run hotter but interestingly on the point behind the LED where you would expect it. The TF on the other hand has a hotter back-end where the supply is, it makes sense as the supply is more inefficient in the TF.

LED V   LED mA    LED W     in V ac    in ma Ac   in W         Efficiency      Light "points" 
72.7     127.97      9.30         235.8        51.5      12.1437      76.61            6.43
10.39    466.18     4.84         237.7         51        12.0258      40.27            4.14

So based on all of this i would say the TF to be an unreliable crappy light but admittedly its been running every night for the last 2 years without issue, sure its not very bright and not efficient but it is cheaper, so you get what you pay for hey... i guess i would feel a little less cheated if they at least said it was a 5W LED. on the other hand if they did i probably wouldn't have bought it.  

  

[Guest]

Had a nice 10W LED spot that gave in after 4 years of use every night. Lekker bright.

Got a cheap Takealot one, fitted it, half the light and same as above, earth not connected.

Had to make alterations to the wire so I cannot return it. I am NEVER buying the cheap ones ever again. 

Thinking of taking it off and dumping it, thats how disappointed I am.

[SilverNodashi]

Something interesting about LED lights. Most manufacturers (cheap or expensive) manufacture / sell LED lights according to Lumens, not watts. So, a 10W LED could have 820lm or 940lm. Or even 600lm. The LED lamps themselves are generally more or less the same. Ironically, I have some cheap 10W LED flood lights at home on a day/night switch, been working fine for almost 5 years now. We moved here in July 2011 and I think I put these up about 2 months after we moved in. They are bright enough and I never really compared them to expensive brands. Current draw is 0.7A per light. 

Interestingly, Renesola LED's are some of the brightest I've seen. Their 3W downlight is brighter than a 5W Ellies (I think?) downlight. So, more lumens for the same LED. Will it last as long as the Ellies one, considering that Light = Energy = heat dissipation? I don't know. But I have to replace a 3W Phillips brand "golf ball" in the dining room that died recently. Lasted about 8 months, I think? 

[Guest]

3 hours ago, SilverNodashi said:

Will it last as long as the Ellies one,

If the last okayish, deal!

Have recently experienced the difference in lumens where a now 4w giving more light than a 7w bulb. Vloermoer tyd.

Maybe post here if anyone finds a 3w bulb using less power than a 5w bulb and it gives more light?

Obviously price is a factor but this is one of many placed where the "Victron" brand will never see my money, I will run for the "Voltronic" brand, spending with a smile.

[Weasel]

On 7/29/2016 at 9:59 AM, SilverNodashi said:

Something interesting about LED lights. Most manufacturers (cheap or expensive) manufacture / sell LED lights according to Lumens, not watts. So, a 10W LED could have 820lm or 940lm. Or even 600lm. The LED lamps themselves are generally more or less the same. Ironically, I have some cheap 10W LED flood lights at home on a day/night switch, been working fine for almost 5 years now. We moved here in July 2011 and I think I put these up about 2 months after we moved in. They are bright enough and I never really compared them to expensive brands. Current draw is 0.7A per light. 

Interestingly, Renesola LED's are some of the brightest I've seen. Their 3W downlight is brighter than a 5W Ellies (I think?) downlight. So, more lumens for the same LED. Will it last as long as the Ellies one, considering that Light = Energy = heat dissipation? I don't know. But I have to replace a 3W Phillips brand "golf ball" in the dining room that died recently. Lasted about 8 months, I think? 

Bit late but still. Converter efficiency plays a key role here. in most cases its the supply/converter that breaks in the light, I've had so many osrams like 12 and in a year or so they all died, all of them supply failure, all of them... point is more efficient converters equals less power dissipated in the converter itself equals longer life of the supply. With better efficiency the light is likely to die later by the failure of the LED's but that is more of a slow degrade failure, that's semiconductors for you.. My 3.2ghz wont clock to 4.8 anymore  . Anyway, this is what impresses me most of the Renesola lights , i've tested many many many of them and they all live up to their specs and run cooler than competitors. Recently got myself a Lux meter and compared a 5W downlight to a halogen 50W osram(not that it matters) both 35deg angle. The 5W kicked its arse being far brighter and at a 10th of the power draw. 

With respect to Cheap and expensive LED chips BigClive has some interesting notes on it, Ive got some CREE Xlamp to play with a while back and they cost but they are balanced, again this is going to translate to lifespan.

 

 

[___]

I do that very same balance test on LED chips nowadays. I think I said it earlier, but on my lamps its the LEDs that fail. You see it happening gradually,  because the chip has 9 LEDS, 3 strings of 3. One fails and initially you just see the light is dimmer, but if you use an old welding helm you can see it clearly: One row is out. Then a while later another one goes and now you can see with the naked eye that just one row still works. Then it starts flickering an finally it fails completely.

On one lamp I replaced the LED chip. Within a day the power supply failed :-)

[mohfamous]

Will it last as long as the Ellies one,

[Crankshaft]

Old thread this, but here goes:

Anyone here have experience with the Ledvance / Osram LED floodlights? 

I need about fifteen 10 watt floods for perimeter security.

I've always considered the Osram brand to be the best, but it seems this may no longer be the case.

Maybe I'm better off going with half as many 20 watters.

One sees these cheap 10w floods for R60 so - wonder if they are any good.

 

 

 

[Guest]

12 minutes ago, Crankshaft said:

One sees these cheap 10w floods for R60 so - wonder if they are any good.

Every single one I bought cheap, failed within +-1 year.

Edited August 23, 2019 by Guest