| General > General Technical Chat |
| I thought LED lights were efficient? |
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| wraper:
--- Quote from: themadhippy on April 06, 2022, 12:19:40 pm --- --- Quote ---Most of what V-TAC sells is below average. Of what you linked, V-TAC is the worst --- End quote --- Have you actually installed any of there stuff? On a previous contract we used a lot of there stuff,the only minor issue was the ip rated down lights didnt come with instructions on the order of 2 silicon seals,however trial and error got it sorted.Over 12 months on and no call backs or failures and were not talking 1 or 2 fittings here,im talking about large retail spaces. --- End quote --- I have a few V-TAC bulbs in my house. Purchased them only because because they were at sale for EUR 1 - 1.20 a piece for a 9-11W bulb. They are the least efficient of what I have and have a linear regulator inside them so I put there whey they are used only occasionally. V-TAC with at least 100 l/m is an unobtanium rarity (check their website). Even more expensive "Samsung LED" models have the same crap efficiency. They have a linear regulator and a very small number of LEDs inside for given power. Most of the half decent bulbs of such power have a switch-mode ballast inside them but not V-TAC. |
| Northy:
These were the V-TAC battens that I was thinking of getting: https://cpc.farnell.com/v-tac/667-vt-8-40/grill-fitting-40w-led-120cm-6400k/dp/LA07398 Do you really think the Integral LED ones: https://www.toolstation.com/integral-led-lightspan-ip20-ik08-batten/p16505 Or LAP ones: https://www.screwfix.com/p/lap-oxbo-single-4ft-led-batten-18w-2100lm-220-240v/465pp#BVQAWidgetID Are actually much better? I have one of the 4ft V-TAC retrofit tubes in an existing fixture already in the garage and have had no issues with it so far. G |
| wraper:
--- Quote from: Northy on April 06, 2022, 12:50:41 pm ---These were the V-TAC battens that I was thinking of getting: https://cpc.farnell.com/v-tac/667-vt-8-40/grill-fitting-40w-led-120cm-6400k/dp/LA07398 --- End quote --- This is surprisingly decent for V-TAC, 120 lm/w. --- Quote ---Do you really think the Integral LED ones: https://www.toolstation.com/integral-led-lightspan-ip20-ik08-batten/p16505 Or LAP ones: https://www.screwfix.com/p/lap-oxbo-single-4ft-led-batten-18w-2100lm-220-240v/465pp#BVQAWidgetID Are actually much better? --- End quote --- All of them have about the same efficiency, 116-120 lm/w |
| madires:
I have also some V-TAC LED bulbs and strips. No problems so far. |
| PushUp:
This topic is too big, to give a comprehensive reply...but what is always true: "don't trust any label or imprint"! ^-^ Just a short note, from what I have experienced so far: 1. OSRAM (2700K / 8.5W / 68mA) My experience: - OSRAM does not last very long, but you can repair them easily - the power factor is very bad: 0.59 PF 2. NEDIS (2700K / 11W / 70mA) My experience: - I am quite happy with this brand - the power factor is not that bad: 0.89 PF 3. OSRAM filament Cool White (4000K / 11W / 52mA) My experience: - filament means = beyond repair (at least for me!) - as it is "cool white" the power factor is very good: 0.95 PF (the best power factor for LEDs I have seen so far) - in contrast to "cool daylight filament": 0.61 PF (6500K / 10W) - and in contrast to "warm white filament": 0.59 PF (2700K / 11W) ...i will probably check some more led fluorescent lamps in the future... Here my two G13 (120cm) LED fluorescent lamps as a comparison: a cheap one from "Müller Licht" with 0.54 PF and a more expensive one from Osram with 0.92 PF. When I am not mistaken the Osram was the same price as the complete LED fluorescent lamp from "Müller Licht" in an IP65 housing with 2 x G13, 120cm; of course not the best build quality, but you get what you pay for... ;-) Müller Licht G13, 120cm (4000K / 18W / 151mA) with the worst power factor for LEDs I have ever seen: 0.54 PF ...and here the whole lamp with 2 x G13, this time with a power factor of: 0.58 PF for both LED fluorescent lamps in the IP65 housing: OSRAM LED SubstiTUBE STAR ST8S, 120cm (6500K / 16.4W / "no info" mA) with the 2nd best power factor for LEDs I have seen so far: 0.92 PF Cheers! ;) |
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