Check the listing for details. 250 watt Duro-Test OPTIMARC 5200K full SPECTRUM LIGHT BULB convert HPS to MH 913. Condition: New. Listed at 455.50 USD. 250 watt Duro-Test OPTIMARC 5200K full SPECTRUM LIGHT BULB converts HPS to MH product number 913 rated 91 CRI G. W. JUSTICE STORE ESTABLISHED 1888 " WE DO YOUR DOLLAR JUSTICE " Item Description; box of one bulb, #913 or 0913 note; we do have a substitute for this bulb, see item number 180177854502 SEE OUR FULL LINE OF GROW LIGHTS, and other DURO-TEST Lighting at our eBay store The OPTIMARC 250 WATT IS A SUBSTITUTE FOR STANDARD HIGH PRESSURE SODIUM BULBS. IT IS MADE BY DURO-TEST, (FOUNDED 1929) AND IS NEW. DURO-TEST HAS MADE BULBS FOR N.A.S.A AND KODAK NO MATTER WHAT YOU ARE GROWING, THIS BULB IS THE BEST BY FAR. contact us toll free ask ebay for our 800 number if you have any questions or problems whatsoever OPTIMARC GROW LAMP -- MFG. CATALOG PRICE ORIGINALLY $211.66 no longer made / and no longer AVAILABLE FACTORY DIRECT WE DO HAVE A SUBSTITUTE AVAILABLE IN OUR EBAY STORE FOR THIS BULB THAT IS ALMOST IDENTICAL, SEARCH FOR " OPTIMARC SUB " TECHNICAL INFORMATION : LAMPS COMPLY WITH FEDERAL STANDARD 21 CFR 1040.30 FOR NON SELF-EXTINGUISHING METAL HALIDE LAMPS SCROLL DOWN FOR MORE INFORMATION Optimarc Lamps are super metal halide lamps made to replace High Pressure Sodium lamps in standard high pressure sodium fixtures. They are available in 250 and 400 watt sizes. Optmarc lamps should ONLY be used in fixtures equipped with HPS ballasts. Lumen output is approximately 28,000 lumens in the 400 watt model. Optimarc may be burned in any position. Use in fixtures using an HPS ballast, preferably a regulated lag ballast, such as the Advance brand with capacitor & ignitor One of our customers who grows orchids for a living who used our Vita-Lite full spectrum fluorescents for years, decided to try something to save energy costs; and, after switching to HPS, she had trouble with blooming as well as the color and shape of and number of blooms. We sold her this bulb so she would not have to buy new fixtures, and she was delighted. It closely conforms to CIE standards for full spectrum natural light, and has long been known as the very best H.I.D. grow light for all plants. CALL US FOR ALL YOUR LIGHTING NEEDS - WE WILL SPECIAL ORDER AND LIST ITEMS ON EBAY UPON REQUEST note; WE CAN NOT OFFER A WARRANTY ON THESE, BECAUSE THEY ARE NO LONGER MADE. SOLD AS IS, SHIPPED INSURED JUST IN CASE SOMETHING HAPPENS IN TRANSIT. By purchasing this item buyer agrees to all terms of sale published at our eBay store { ^ } I Agree AND remember the old saying, "....ought to have bought it when I saw it."