X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 09 Jun 2010 13:13:47 -0400 Message-ID: X-Original-Return-Path: Received: from vms173015pub.verizon.net ([206.46.173.15] verified) by logan.com (CommuniGate Pro SMTP 5.3.7) with ESMTP id 4340997 for lml@lancaironline.net; Tue, 08 Jun 2010 22:26:25 -0400 Received-SPF: pass receiver=logan.com; client-ip=206.46.173.15; envelope-from=tom.gourley@verizon.net Received: from jacky0da39824a ([unknown] [71.111.139.80]) by vms173015.mailsrvcs.net (Sun Java(tm) System Messaging Server 7u2-7.02 32bit (built Apr 16 2009)) with ESMTPA id <0L3Q000VX6QZRN74@vms173015.mailsrvcs.net> for lml@lancaironline.net; Tue, 08 Jun 2010 21:25:48 -0500 (CDT) X-Original-Message-id: <15BF8371314C4350B73641B62B703E9E@jacky0da39824a> Reply-to: "Tom Gourley" From: "Tom Gourley" X-Original-To: "Lancair Mailing List" References: Subject: Re: [LML] UV Exposure in Cockpit through Acrylic Canopies X-Original-Date: Tue, 08 Jun 2010 19:24:49 -0700 MIME-version: 1.0 Content-type: multipart/alternative; boundary="----=_NextPart_000_001B_01CB0740.433E5150" X-Priority: 3 X-MSMail-priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5931 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.5931 X-Antivirus: avast! (VPS 100608-1, 06/08/2010), Outbound message X-Antivirus-Status: Clean This is a multi-part message in MIME format. ------=_NextPart_000_001B_01CB0740.433E5150 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable UV Exposure in Cockpit through Acrylic Canopies"I noticed the other day = that my transition lenses were ~half tinted while flying in some sun = inside my air conditioned LIVP at FL210, so UV must be penetrating the = thick acrylic canopy material. This is not the case inside a car." Don't forget that UV levels increase about 2% with every 1000' rise in = altitude. At FL210 the UV level will be about 40% higher than at sea = level. If you could drive your car at 21,000' you might see some change = in your transition lenses. Tom Gourley ------=_NextPart_000_001B_01CB0740.433E5150 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable UV Exposure in Cockpit through Acrylic = Canopies
"I noticed the other day that my transition lenses were ~half = tinted=20 while flying in some sun inside my air conditioned LIVP at FL210, so UV = must be=20 penetrating the thick acrylic canopy material.  This is not the = case inside=20 a car."
 
Don't forget that UV levels increase = about 2% with=20 every 1000' rise in altitude.  At FL210 the UV level will be = about 40%=20 higher than at sea level.  If you could drive your car at 21,000' = you might=20 see some change in your transition lenses.
 
Tom Gourley
 
 
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