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23.11.2010, 01:42 | 1 |
Увлеченный
Регистрация: 25.06.2010 Последняя активность: 24.06.2015 07:00 Адрес: Polska - Wroclaw
Сообщений: 57
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Поблагодарили: 24 раз(а) в 11 сообщениях
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Silva Alpha vs Petzl Ultra - the ultimate challenge…
Some days ago I get in my hands two headlamps : Silva Alpha 6 (about 349 € / 500 $ ) and Petzl Ultra Blet 4 (about 299 € / 499$)
Here you can see what came out from that meeting Heads are similar in size, but it is easy to see that ultra is beating the alpha in led’s quantity . 3x Luxeon K2 TFFC vs 6x Seoul Semiconductors SSC P4 But the claimed output doesn't show that: 540 lumens vs 350 lumens Alloy vs. composite, what will be lighter ? Alphas head weight only 183 g instead 213 g of ultra Power source – both are using 7,2V Li-Ion packs but they have totally opposite approach to that case. Silva is using heat shrinking tube and neoprene - battery pack weights 326g and have 6,9 Ah capacity. Petzl instead is using hard composite case - battery pack weights 270g and have only 4.0 Ah capacity. Additional equipment. No extras from petzl, but Alpha is very universal headlamp, in addition to head strap you are getting a clip on helmet mount and a handlebar mount. You can easily convert yours alpha into a bike or a helmet light. Light output I was wondering why Petzl is getting only 350 lumens from the Ultra for some time, only 350 lumens from 6 emitters After seeing it for the first time in catalogue I was betting that this lamp is overheating and I was right. On the left, Ultra on high right after turning on, it is giving about 450 lumens - compared it to my quad Cree - then about 10 minutes later… Everything is clear . Power consumption and burn time: Alpha 6 Код:
mode V-in I-In P-In Calculated burn time. high 6,8 2,060 14,01 3,64 mid 7,1 1,506 10,69 4,77 low 7,1 0,093 0,66 77,32 flood 7,1 0,572 4,06 12,57 Код:
mode V-in I-In P-In Calculated burn time. high 7,3 1,250 9,175 3,13 mid 7,6 0,432 3,292 8,74 low 7,7 0,117 0,903 31,88 Let’s take it outdoor, there was about 2 Celsius degree outside so both headlamps were pretty well cooled . On high On mid On low And alpha’s flood (only led is burning) vs ultra low. Reflective markers are set in a 5 m distance - the light is pointed on 10 m marker. |
Поблагодарили: 1 раз |
alexeile (11.10.2012)
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