This is an extension lead from Ballast to lamp - so it has a round earth pin just like the reflectors.
NOTE: Understand that not all ballasts will start a lamp over this distance due to loss of power over the lead distance. For example, cheap factory lighting has the ballast attached to the lamp to keep losses down and allow for a very low power and cheaper ignitor.
We have had trouble with cheap ballasts made to a price. They don't have enough starter power. They also don't last as long as good ballasts and end up costing more by replacing them when they fail.
We have found good value and quality in JBL Ballasts and these will usually start, as will Lumatek Digital Ballast - but even so, if the power supply is a little variable, and not enough amps get to the ballast, then the lead may have too much line loss to start the lamp. If any doubt - use our 4m lead instead.
lighting fittings and reflectors
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