Boyd Lighting warrants to the reseller, for three (3) years, from date of purchase that its products are free from defects of material or workmanship. Boyd’s obligation is expressly limited to the repair or replacement of the fixture, only after prior written authorization has been granted. This warranty shall not apply to products which have been altered or repaired outside our factory or without our knowledge, nor shall it apply to costs incurred in the installation of warranted products. This warranty is in lieu of all other warranties, expressed or implied, and without limiting the generality of the foregoing phrase, excludes any implied warranty of merchantability. Also, there are no warranties which extend beyond the descriptions of the product on the company’s literature setting forth the terms of sale.