J2087_200603 Daytime Running Light

Maximum Candela Values Allowed

Based on several study reports released from UMTRI as concerns from federal regulatory authorities regarding complains for glare, the new maximum candela values have been set for two cases. For the dedicated DRL, it is 1500 cd. This is harmonized with the current ECE requirement. For other lamps serving for DRL function, the maximum is kept at 3000 cd, however, it must be below the H-H line from H-V to left: to avoid glare.

Unified Photometry Table for Other Lamps Serving DRL Function

A new photometry table has been introduced in this version of J2807 in 6.2.2 as Table 2. This table is based on the bench mark studies of many existing DRLs and other lamps on the road. The photometry values have been derived with considerations of both the most effective DRL (reference to UMTRI reports) and adequate DRL when using other lamps. The new table provides the industry, in additional to consistence, more design freedom and flexibility. Table 1 has been kept in this version with only change for the maximum allowed candela value for the reasons stated in the above. The latest UMTRI report indicates that the (minimum) photometry values in the Table 1 is still most effective for DRL function. For those of the vehicle and lamp manufactures who apply dedicated DRLs on vehicle, Table 1 should be the standard to be used. The UMTRI report also indicates that other lamps serve as DRL functions provide some effectiveness for safety and conspicuity.

Masking Requirements

For the dedicated DRL with maximum candela value of 1500, no masking is needed in relating to the front turn signal lamps. For other lamps serving DRL function, the masking requirements are specified in 6.2.2.