David Hansen wrote:

On Wed, 08 Mar 2006 15:58:30 -0400 someone who may be Derek
Broughton wrote this:-

Handling them... Maybe they're tougher than they look, but something so
like a 4' fluorescent tube doesn't inspire confidence.

The glass is rather stronger than that found in fluorescent tubes.

An engineer friend tells me that they also frequently suffer from
seal failure.

That certainly was a problem with some designs.

Why would you put a lip there?

Why personalise the discussion by asking what I would do?

Sorry, why would one put a lip there? Really, it's not personal, it's just
a matter of not buying poor designs.

The fact
is that there is likely to be a small lip, if only to retain things.

No need for it to be anything more than a millimeter.

I have no idea how much attention manufacturers pay to detailing in
terms of shedding snow, but I imagine UK manufacturers pay it no
attention.

otoh, I was talking about a local Nova Scotian manufacturer, who put a _lot_
of thought into snow...
--
derek