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[dave w]

I suspect many of your 14 tubular LED bulbs will have experienced premature failure before then.

ACT, who once made X10 protocol products,  designed and manufactured four foot LED tubes. And that was when they closed their doors. High failure rate put hem out of business.

Heck they can't even get CFLs to last a quarter of their projected life, let alone getting LEDs to light for any length of time. (Noope, no disappointing experiences here). 

[dhouston]

High failure rate put hem out of business.

Given that other LEDs need heat dissipating fins, I'd think a 4' x 1" diameter tube containing several LEDs plus one or two switching power supplies might get somewhat toasty.

http://www.amazon.com/Philips-453340-Light-White-Non-Dimmable/dp/B00NP2MYO0/ref=sr_1_5?s=hi&ie=UTF8&qid=1446777664&sr=1-5&keywords=led+lights&refinements=p_n_feature_four_browse-bin%3A3594361011
http://www.amazon.com/Cree-Equivalent-White-2700K-3-Way/dp/B00L4P0XKM/ref=sr_1_8?s=hi&ie=UTF8&qid=1446777859&sr=1-8&keywords=led+lights&refinements=p_n_feature_four_browse-bin%3A3594361011
http://www.amazon.com/Cree-Equivalent-White-2700K-4-Pack/dp/B00M0CPTAW/ref=sr_1_11?s=hi&ie=UTF8&qid=1446778058&sr=1-11&keywords=led+lights&refinements=p_n_feature_four_browse-bin%3A3594361011