This is a brand-new lamp that replaces the STERILIGHT / Viqua S410RL-HO (High Output) and others, while retaining 100% compatibility with the OEM lamp selling at a much higher price, but not made by Sterilight / Viqua. The lamp has a special multi-step 4 pin base, designed specifically for water purification systems by Sterilight and Viqua.<br><br> It measures about 508mm (about 20 inches), excluding the four pins on the end of the lamp. Its peak output is at 254nm (UV-C).<br><br> It is used to replace the OEM lamp in these and other systems:<br> R Can S410RL-HO<br> R Can SC-410<br> R Can SC410<br> R Can SP-410<br> R Can SP410-HO<br> R Can SPV-410<br> R Can SPV410<br> R Can SPV-8<br> R Can SPV8<br> Sterilight S410RL-HO<br> Sterilight SC-410<br> Sterilight SC410<br> Sterilight SCM-410<br> Sterilight SCM410<br> Sterilight SP-410<br> Sterilight SP-410-HO<br> Sterilight SP410<br> Sterilight SPV-410<br> Sterilight SPV410<br> Sterilight SPV-8<br> Sterilight SPV8<br> Viqua VH-410<br> Viqua VH410<br> Viqua VH410-F20<br> Viqua VH410M<br><br>This lamp is EPA regulation compliant.<br><br>All lamps listed are are compatible with the Sterilight / Viqua brand UV products. We do not sell Sterilight / Viqua brand lamps. All Sterilight / Viqua brand names, trademarks and logos are property of Sterilight / Viqua.